[clang] [NFC][analyzer][docs] Migrate 'annotations.html' to RST (PR #122246)

[Kristóf Umann via cfe-commits]

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

Shouldn't we leave a stub in the old HTML page that the docs were moved? Or we haven't done that in the past either?

I understand (and strongly agree with) you not making any meaningful changes to the docs page you moved. With that said, later down the line, we should make sure that checkers are called "checkers", and not "checks" (the latter is used in clang-tidy), and that `ownership_.*` attributes must be mentioned here as well.

Otherwise LGTM, thanks for the work!

https://github.com/llvm/llvm-project/pull/122246