Rollup merge of #56689 - QuietMisdreavus:rustdoc-lint-group, r=pnkfelix

add a lint group for lints emitted by rustdoc

As rustdoc adds more lints that it specifically manages, it would be nice to be able to lump them all together. This gives us a new group just for that.

I deliberately didn't include `missing_docs` because this is kind of a stepping stone for moving our lints into tool lints (i.e. `#![warn(rustdoc::private_doc_tests)]`), since all of these are specifically emitted by rustdoc. If we want to move `missing_docs` out of the compiler, that's also an option, but it would create a surprising change of behavior.

I also took the chance to rewrite the lint descriptions of these lints to better match the style of the other lints. `>_>`

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