Save: the save commands' params text names the notes on options

document.save's params text, which file.saveAs, file.saveCopy and
file.saveAsTemplate share, now says that the warnings also name each key
given in `options` that the format doesn't read.

crates/engine/src/cmd/fileio/save.rs

@@ -1072,7 +1072,7 @@ pub(super) fn specs() -> Vec<CommandSpec> {
             "Save Document",
             [],
             None,
-            "{path?, format?: vectorcraft|template|pdf|svg|svgz|ai|eps (default: the path's extension, else the document's own format), options?: {…the format's options, see file.formatOptions; default: as last saved}, svg?: {…SVG options} (an SVG save keeps hidden layers, display:none, unless hiddenLayers is false), …the SVG and PDF options given flat instead (an option given flat or in svg and in options with different values is an error), compress?: bool (native, also in options: gzip; default: the useCompression preference; warnings say when the format doesn't read compress, version, preview or precision given flat), version?: 4 (3, 2 or 1: for older VectorCraft versions; 1 and 2 are never compressed), preview?: false (embed a PNG of the first artboard, at most 256 px), precision?: 0..9 (native: round path anchors and handles to this many decimal places, a smaller file; colors, transforms and type stay exact; default: exact, and a later save without it writes exactly again), separateArtboards?: false (native and .ai: also save each artboard of `range` to <name>-<artboard>.<ext> beside the file, holding that artboard and the art touching it; the result's files lists every file written), range?: \"1-3, 5\"|\"all\" (default; with separateArtboards), includeLinked?: false (keep linked files' own pixels, not just their previews; they stay linked), embedProfiles?: true (carry the ICC profiles loaded from files that the document is tagged with; opening the file installs them where missing), pdfCompatible?: false for native (also carry a PDF of every artboard) | true for .ai (false: blank pages, only the native document; a .ai file's compress, default true, is its compression.compressText), modified?: Unix seconds|null (the File Info modified date, and created date when there is none, a save to a file stamps; default now, recorded in the journal so a replay matches; null: leave the dates)} → {path, format, bytes, warnings, files?: [path…] (the file and its artboards' files), linked?: [path…] (images an SVG links to)}. Save writes one artboard, except a .ai file: a PDF-compatible file of every artboard carrying the native document (preserveEditing always on; PDF options flat or in options), which document.open restores exactly; separateArtboards writes more files, one per artboard. EPS saves the chosen artboard (first by default), retaining its page margins and the whole editable document; its PostScript appearance flattens transparency, as EPS requires. Without a path it writes the document's own file in its own format: a document opened from or saved as SVG/PDF/EPS saves as that again (warnings name what the format loses). No path known (never saved, converted from an older version, restored by Data Recovery, or another format) → {dataBase64, format, name, folder?, warnings} and the document stays modified",
+            "{path?, format?: vectorcraft|template|pdf|svg|svgz|ai|eps (default: the path's extension, else the document's own format), options?: {…the format's options, see file.formatOptions; default: as last saved}, svg?: {…SVG options} (an SVG save keeps hidden layers, display:none, unless hiddenLayers is false), …the SVG and PDF options given flat instead (an option given flat or in svg and in options with different values is an error), compress?: bool (native, also in options: gzip; default: the useCompression preference; warnings say when the format doesn't read compress, version, preview or precision given flat, or a key given in options), version?: 4 (3, 2 or 1: for older VectorCraft versions; 1 and 2 are never compressed), preview?: false (embed a PNG of the first artboard, at most 256 px), precision?: 0..9 (native: round path anchors and handles to this many decimal places, a smaller file; colors, transforms and type stay exact; default: exact, and a later save without it writes exactly again), separateArtboards?: false (native and .ai: also save each artboard of `range` to <name>-<artboard>.<ext> beside the file, holding that artboard and the art touching it; the result's files lists every file written), range?: \"1-3, 5\"|\"all\" (default; with separateArtboards), includeLinked?: false (keep linked files' own pixels, not just their previews; they stay linked), embedProfiles?: true (carry the ICC profiles loaded from files that the document is tagged with; opening the file installs them where missing), pdfCompatible?: false for native (also carry a PDF of every artboard) | true for .ai (false: blank pages, only the native document; a .ai file's compress, default true, is its compression.compressText), modified?: Unix seconds|null (the File Info modified date, and created date when there is none, a save to a file stamps; default now, recorded in the journal so a replay matches; null: leave the dates)} → {path, format, bytes, warnings, files?: [path…] (the file and its artboards' files), linked?: [path…] (images an SVG links to)}. Save writes one artboard, except a .ai file: a PDF-compatible file of every artboard carrying the native document (preserveEditing always on; PDF options flat or in options), which document.open restores exactly; separateArtboards writes more files, one per artboard. EPS saves the chosen artboard (first by default), retaining its page margins and the whole editable document; its PostScript appearance flattens transparency, as EPS requires. Without a path it writes the document's own file in its own format: a document opened from or saved as SVG/PDF/EPS saves as that again (warnings name what the format loses). No path known (never saved, converted from an older version, restored by Data Recovery, or another format) → {dataBase64, format, name, folder?, warnings} and the document stays modified",
             has_doc,
             |s, p| save(s, SaveMode::Save, p)
         ),