Add supported color models in GHFM

[thispsj]

Why:

Closes #17312

What's being changed:

Adds Supported color models.

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• For content changes, I have completed the self-review checklist.

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Content directory changes

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Source	Preview	Production	What Changed
get-started/writing-on-github/getting-started-with-writing-and-formatting-on-github/basic-writing-and-formatting-syntax.md	fpt ghec ghes@ 3.5 3.4 3.3 3.2 3.1 ghae	fpt ghec ghes@ 3.5 3.4 3.3 3.2 3.1 ghae

[cmwilson21]

@thispsj Thanks so much for opening a PR! Looks like this one is a duplicate of #18478. So I'm going to go ahead and close it.

Thank you for your passion in improving the docs! We appreciate all the contributions you have been making. 💖

[thispsj]

@cmwilson21 no worries. Didn't have luck this time (maybe next time) 😅 .