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

[Oliver Hunt via cfe-commits]

ojhunt 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.

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