docs: Suggest checking `zed_extension_api` compatibility (#30474)

Or your extension might not work as expected. Or you have to downgrade
`zed_extension_api` later. Happened
[here](https://github.com/sectore/zed-just-ls/issues/2) or
[here](https://github.com/zed-extensions/ruby/commit/842b0cdb6995e692552645c0584ecc9991c589b1)
recently.

Release Notes:

- N/A
e4525b80f8Jens Krause committed on 5/10/2025, 9:07:00 PM· committed by GitHubparent18a2a50
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