Feature : Components Documentation for "rest props"

[Vrishabhsk]

What?

• Extend the documentation for component which incorporate and allow rest props

Why?

• Components: Document when "rest props" are passed down to underlying element/component #67979

Screenshots or screencast

Before	After

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[mirka]

Displaying it as a fake arg is kind of interesting!

We have some subtle concerns we need to balance here though, which are:

• We can't do this in the props tables for subcomponents. Not a blocker, but something to think about.
• As you can see in this file too, we're gradually migrating the component READMEs to auto-generated versions. So ideally we want one canonical source of this information, which we automatically display in multiple locations (e.g. README, Storybook).

So I'm thinking maybe we can put this information in a designated field in the docs-manifest.json, from which we can display it as a fake prop in Storybook and as a line in the auto-generated README. What do you think?