Add/block types list component readme

[JustinyAhin]

Description

Added documentation for the block types list component (see #22891)

How has this been tested?

N/A, documentation only

Types of changes

Documentation

Checklist:

• [n/a] My code is tested.
• [n/a] My code follows the WordPress code style.
• [n/a] My code follows the accessibility standards.
• [n/a] 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.

[mkaz]

This looks fine. If you want you can add clarity that the items is an Array of blocks.
Something like Type: Array<Block>

Unfortunately the types aren't clearly defined everywhere, but the goal is to get all functions using typescript jsdoc to define, that makes all this easier. Here's a reference on defining type structures: https://www.typescriptlang.org/docs/handbook/jsdoc-supported-types.html