[clang-tools-extra] FIX : bugprone-too-small-loop-variable - false-negative when const variable is used as loop bound (PR #81183)

[Piotr Zegar via cfe-commits]

https://github.com/PiotrZSL requested changes to this pull request.

Fixes in documentation mainly needed, and could be.

https://github.com/llvm/llvm-project/pull/81183