Sergey Biryukov 0c53d8ef73 Docs: Fix typo in _validate_cache_id() description. ...

Includes:
* Capitalizing "ID" in a consistent way.
* Expanding the comment on not using `filter_var()`.
* Adding a `@covers` tag for the function in unit tests.
* Minor tweak to the `_doing_it_wrong()` message.

Follow-up to [53818], [55543].

See #57593.
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git-svn-id: http://core.svn.wordpress.org/trunk@55061 1a063a9b-81f0-0310-95a4-ce76da25c4cd

2023-03-14 16:55:19 +00:00

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