[clang-tools-extra] [clang-tidy][doc] Document that Class* options apply only to static members (PR #227600)

[Baranov Victor via cfe-commits]

https://github.com/vbvictor approved this pull request.

LGTM, by the way did you check that in tests we also check `static` methods for ClassMethodCase and friends?

https://github.com/llvm/llvm-project/pull/227600