[llvm] [IR] Fix typo in trunc nuw semantics; NFC (PR #87285)

[via llvm-commits]

goldsteinn wrote:

> > > @goldsteinn should I amend the commit title to include [IR]?
> > 
> > 
> > No need (didn't see it was already merged)
> 
> afaict this hasn't been merged yet, not sure what you mean by that...

hehe, yeah saw the merged tag on the PR you linked.

Yeah change the commit message.

https://github.com/llvm/llvm-project/pull/87285