[clang] [clang][InstallAPI] Fix doc comment weirdness (PR #215462)

[Timm Baeder via cfe-commits]

tbaederr wrote:

This is a lame attempt to fix this documentation weirdness in our docs:
<img width="1248" height="200" alt="Screenshot From 2026-08-11 08-12-14" src="https://github.com/user-attachments/assets/df708390-2543-4a55-865f-d8184515d54b" />


https://github.com/llvm/llvm-project/pull/215462