[clang] [clang] Correct FixIt ranges for unused capture warnings (PR #141148)

[Oliver Hunt via cfe-commits]

ojhunt wrote:

 > Documentation failure says:
> 
> Warning, treated as error: /home/runner/work/llvm-project/llvm-project/clang-build/tools/clang/docs/DiagnosticsReference.rst:18009:Unexpected indentation.

Right, but I don't know how/what is causing the failure as I haven't changed any diagnostics? :(

https://github.com/llvm/llvm-project/pull/141148