Docs: paraphrase the HEIF help-page reference

docs/target-app-parity.md

@@ -1329,7 +1329,7 @@ Moved from the ROADMAP's "Shipped so far" on 2026-10-10. Update it when a featur
   - PCX files (`.pcx`) open and place, from the ZSoft PCX Technical Reference Manual: 1 bit in the header palette's first two colors (black and white when the version has no palette or both colors are the same), 1 bit in two to four planes and 4 bits with up to 16 colors from the header's palette (the EGA colors for versions 0 and 3), 2 bits in the CGA colors that the header's CGA palette settings pick (background, color burst, palette and intensity), 8 bits with the 256-color palette after the image data (gray levels without one) and 24-bit color in three planes, run-length encoded. The header's HDpi and VDpi size the image. A file of another depth or plane count, one cut short, and one whose pixels as RGBA pass the pixel allowance are refused with a message before its pixels are decoded. Open and Place recognize a PCX file by its extension, and `clipboard.importImage` and Glass's Load Texture… by its header; a PCX file copied in a file manager pastes as a bitmap (`crates/engine/src/cmd/fileio/tests_pcxread.rs`).
   - Pixar picture files (`.pxr`) open, place and paste, from "The Format of Stored Pictures" in the Pixar Image Computer manuals: any set of the R, G, B and A channels in 8 or 12 bits, dumped or run-length encoded with all four packet kinds and block ends, in tiles of any size (pixels of border tiles past the picture are dropped). R alone is gray, a missing color channel is 0 and a missing A opaque; 12-bit samples are clamped to 0.0 to 1.0; color matted to black becomes straight color; a null tile is transparent when the picture has A and black otherwise. The offsets aren't read, and the image takes the default resolution. Version 2 headers read like version 0. A file cut short, one with a tile whose writing wasn't finished, one with header values or packets the format doesn't define, and one whose pixels as RGBA pass the pixel allowance are refused with a message. Every reader recognizes a Pixar file by its magic number. Tested on synthetic files only (`crates/engine/src/cmd/fileio/tests_pxrread.rs`).
   - JPEG 2000 JP2 and raw codestream images open and place from `.jpf`, `.jpx`, `.jp2`, `.j2k`, `.j2c` and `.jpc`. Each axis uses the valid display resolution (`resd`), else the valid capture resolution (`resc`), whichever box comes first ([ITU-T T.800](https://www.itu.int/rec/T-REC-T.800/en), I.5.3.7.2); an axis with none uses 72 ppi. Multiple codestreams, JPX composition or layers, and unsupported color spaces are refused with a message. The decoder checks image size before allocating (`crates/engine/src/cmd/fileio/tests_jp2read.rs`).
-  - HEIC and HEIF images open and place from `.heic` and `.heif`, as the [supported file formats](https://helpx.adobe.com/illustrator/kb/supported-file-formats-illustrator.html) list High Efficiency Image under both Open and Place (and [Fix HEIF file import errors on Windows](https://helpx.adobe.com/illustrator/desktop/add-and-import-files/import-other-file-types/fix-heif-file-import-errors-on-windows.html) covers "opening or placing a HEIF file"): HEVC-coded single pictures and grids of tiles, 8 to 10 bits, with an alpha image, decoded by heic-rs in the engine's default `heif` feature. The container's rotation, mirror and crop are applied. Without an `nclx` box, the HEVC stream's video signal type gives the samples' matrix and range. An RGB ICC profile, or Display P3 with the sRGB curve named by an `nclx` box or, without a color box, by the stream, is converted to sRGB; the EXIF resolution tags size the image, or 72 ppi. Image sequences, other codings and grids of cropped tiles are refused with a message, and so is every HEIF file in a build without the feature. The decoder checks image size before allocating (`crates/engine/src/cmd/fileio/tests_heifread.rs`).
+  - HEIC and HEIF images open and place from `.heic` and `.heif`, as the [supported file formats](https://helpx.adobe.com/illustrator/kb/supported-file-formats-illustrator.html) list High Efficiency Image under both Open and Place (and [Fix HEIF file import errors on Windows](https://helpx.adobe.com/illustrator/desktop/add-and-import-files/import-other-file-types/fix-heif-file-import-errors-on-windows.html) covers both ways of bringing HEIF files in): HEVC-coded single pictures and grids of tiles, 8 to 10 bits, with an alpha image, decoded by heic-rs in the engine's default `heif` feature. The container's rotation, mirror and crop are applied. Without an `nclx` box, the HEVC stream's video signal type gives the samples' matrix and range. An RGB ICC profile, or Display P3 with the sRGB curve named by an `nclx` box or, without a color box, by the stream, is converted to sRGB; the EXIF resolution tags size the image, or 72 ppi. Image sequences, other codings and grids of cropped tiles are refused with a message, and so is every HEIF file in a build without the feature. The decoder checks image size before allocating (`crates/engine/src/cmd/fileio/tests_heifread.rs`).
   - EPS and DXF in and out, EMF/WMF in and out; PNG (with PNG-8), JPEG, WebP, GIF, TIFF, BMP, Targa and layered PSD export; grayscale TIFFs with an alpha channel or other extra channels place, relink and open, the alpha as the image's transparency (#1466 in part); PSD and PSB files open and place, linked or embedded, as their merged image in every colour mode and depth (#918). EPS import runs a PostScript Level 3 interpreter written from the PostScript Language Reference: resource categories and `resourceforall`, local and global VM (`currentglobal`/`setglobal`/`gcheck`), `clipsave`/`cliprestore`, subarrays and substrings that share storage, the standard dictionaries in `systemdict`, `dictstack`, `internaldict`, executable filters and strings, `load` by any key, `//name` immediate names, `token`, `execform`, user paths, `cshow`, `rootfont`, `cachestatus`, colour rendering and halftone queries, file `status` and data read with `flushfile`, and `pdfmark` marks dropped (Discord feedback, #466, #469, #474). Masked images (`ImageType 3` in its three interleavings) and reusable streams are read, and an image's several data sources are read in turn, as the reference defines (procedures that read one file get their own rows: such images came in banded, #498). `restore` puts dictionaries back as they were at the `save`, so programs that count their saves in a dictionary read to their end (part of #505). Tiling patterns come in as pattern swatches, uncoloured ones too; Type 3 fonts' glyphs as their outlines, spaced by `ashow`/`widthshow`/`xshow`/`kshow`; mesh and function-based shadings (types 1, 4–7) as gradient meshes; sampled functions (type 0) and Flate/LZW predictors are read. It is tested with programs written from the specification in the ways common generators use these features; Inkscape/cairo EPS files open as vectors. When a file's PostScript still can't be read, it opens as its TIFF preview, its Windows metafile preview (as vectors) or its EPSI preview, and the warning (in the status bar, `document.open`/`app.open`/MCP `open_file` replies and `vectorcraft-cli info`) names the error, the operator that raised it and the procedures it ran in. Legacy PostScript `.ai` files (Illustrator 3–8, written with the prolog that defines their operators) keep their groups and nested groups (`u` … `U`), between and inside clipping groups; EPS and EMF/WMF import nest clips (and groups) at most 128 deep, so a hostile file can't exhaust the stack. DXF TEXT justified Fit or Aligned spans its two points (stretched, or scaled as a whole). PDF export writes type as real, searchable text in embedded subset fonts by default, as Illustrator's PDF presets do (Convert Text to Outlines is an option; printer's marks stay shapes), so text-heavy PDFs stay small (#733). DXF export writes each fill as its outlines followed by its hatch, so laser and cutter software, which skips hatches, gets filled art and type too (#546).
   - TIFFs that store each channel as its own plane (PlanarConfiguration 2) place, relink and open as the same image stored pixel by pixel does, 8 and 16 bits: grayscale with an alpha channel or other extra channels, and CMYK with or without them. A planar CMYK TIFF keeps its ink amounts and is stored as a CMYK TIFF with each pixel's inks together, at the file's resolution. A TIFF whose header claims more strips or tiles than can be counted is refused as too large to draw (#1466 in part; `crates/engine/src/cmd/fileio/tests.rs`).
   - 1-bit TIFFs compressed with CCITT Group 3 (ITU-T T.4) place, relink and open: Compression 2 (modified Huffman) and Compression 3 with one-dimensional rows or, with T4Options bit 0, two-dimensional ones, with or without fill bits, in strips or tiles, with either FillOrder and either polarity. Rows in T.4's uncompressed mode are not read. A file whose pixels would take more than the decoding allowance as RGBA is refused as too large to draw (#1466 in part; `crates/engine/src/cmd/fileio/tests.rs`).