Docs: Add post meta limitations to Block Bindings API docs #68583
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Closes: #68574
What?
Add documentation about post-meta limitations in the Block Bindings API documentation, specifically covering protected meta and REST API requirements.
Why?
The current Block Bindings documentation doesn't mention important limitations regarding post-meta usage. Developers need to know upfront that:
How?
Add a callout alert section in
docs/reference-guides/block-api/block-bindings.md
before the "Compatible blocks and their attributes" section. The callout follows the existing documentation style and alerts about both limitations clearly.Testing Instructions
/docs/reference-guides/block-api/block-bindings.md
Screenshots or screencast