[clang] [NFC][analyzer][docs] Restore/remove orphaned images (PR #122481)

[Donát Nagy via cfe-commits]

NagyDonat wrote:

The first two commits in this PR are separately reviewed at https://github.com/llvm/llvm-project/pull/122246 and I intend to merge them (squashed into a single commit) through that PR.

**In this PR please only review the third commit [[NFC][analyzer][docs] Restore/remove orphaned images](https://github.com/llvm/llvm-project/pull/122481/commits/95b4cd63538dd36c1af7e9ccdce587bd4b3e0d27)** and any follow-up corrections that I upload here.

These two PRs are logically independent, but they edit adjacent locations in the same file (`FAQ.rst`), so I tried to create these stacked PRs to avoid merge conflicts. (I'm not sure that this was the best idea, but I'm trying to experiment a bit with the limitations of Github.)

https://github.com/llvm/llvm-project/pull/122481