[Docs] [Developer Policy] Document best practice of not tagging a username in commit messages and PR descriptions (#164328) Related to: https://discourse.llvm.org/t/forbidding-username-in-commits/86997 **Context:** When we merge a commit including tag to another username (e.g. `@<someUser>`), that account will receive an email / notification every time that PR is cherry-picked and pushed to a fork, generating _a lot_ of spam in the user's inbox. As of today, there's no way of disabling this on GitHub settings. **This PR** documents this error in our developer policy, and reminds contributors to avoid it. **Next steps:** I'm a big believer that any policy that is not enforced via automation is not enforced at all, so I'd love to see some kind of check to prevent this error. However, there does not seem to be an agreement to do that _yet_. I'll see if I can gather support for doing that. --------- Co-authored-by: Jakub Kuderski <kubakuderski@gmail.com>
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