[llvm] [docs] Advise contributors to check for truncated PR titles (PR #68021)

[Philip Reames via llvm-commits]

https://github.com/preames approved this pull request.

LGTM

I agree this is a definite anti-feature in github, and warning about it for now is a good step.

https://github.com/llvm/llvm-project/pull/68021