Component: update color-picker documentation

[amustaque97]

Fixes #38001

Description

After looking into the code and directory structure. Indeed color-picker
README.md file was explaining wrong import. As part of this commit
issue has been addressed.

How has this been tested?

Not sure if documentation change requires any kind of testing. Though I ran once Markdown preview to make sure I didn't break anything else.

Screenshots

Types of changes

Documentation

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code follows the accessibility standards.
• I've tested my changes with keyboard and screen readers.
• My code has proper inline documentation.
• I've included developer documentation if appropriate.
• I've updated all React Native files affected by any refactorings/renamings in this PR (please manually search all *.native.js files for terms that need renaming or removal).
• I've updated related schemas if appropriate.

[fabiankaegy]

Looks good to me. I checked the index.js file of the components and the ColorPicker is exported directly

[alexstine]

Looks good. That component looks terrifying though. Looks like some type of migration from JS to TS not quite complete...