[HttpCache] Document support for closures in Cache attribute #21701
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This PR documents the ability to use PHP closures with the #[Cache] attribute
to compute the Last-Modified and ETag HTTP headers.
Closures can be used as an alternative to expressions and receive the resolved
controller arguments and the current Request object.
The documentation includes examples based on controller arguments and request
attributes, and clarifies that headers already set on the Response are not
overridden.
Issue #21678