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

[Erich Keane via cfe-commits]

erichkeane wrote:

> I don't understand the windows failure (ninja says there was a failure, but I cannot find any failure in the log?)
> 
> I'm also confused by the documentation failure: it's not telling me what/where the error is coming from.
 
Documentation failure says: 

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

I couldn't find the windows reason, but maybe that is the reason for that failure too?

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