The `method` text of `paint.editGradient` and two passages of
docs/mcp.md said a CMYK document writes RGB and Lab gradient stops in
CMYK. An export that converts colors to an RGB destination profile
converts them to that profile first, so in a CMYK document they stay
RGB and a Perceptual spot gradient with such stops is written as an
image with the spot warning. The texts now say so, and the test of RGB
stops in a CMYK document also checks the RGB destination case.
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