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

[Donát Nagy via cfe-commits]

NagyDonat wrote:

Buildbot failure https://lab.llvm.org/buildbot/#/builders/190/builds/12715 is due to "IO failure on output stream: No space left on device" (on a random Mach-O testcase) :sweat_smile:

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