[clang][analyzer] Bring cplusplus.ArrayDelete out of alpha (#83985)

The checker finds a type of undefined behavior, where if the type of a
pointer to an object-array is different from the objects' underlying
type, calling `delete[]` is undefined, as the size of the two objects
might be different.

The checker has been in alpha for a while now, it is a simple checker
that causes no crashes, and considering the severity of the issue, it
has a low result-count on open-source projects (in my last test-run on
my usual projects, it had 0 results).

This commit cleans up the documentation and adds docs for the limitation
related to tracking through references, in addition to moving it to
`cplusplus`.

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Co-authored-by: Balazs Benics <benicsbalazs@gmail.com>
Co-authored-by: whisperity <whisperity@gmail.com>