[GitHub] Allow shortcut for "introductory issue" and request linking to issue in PR (llvm#84635)

The answer to many requests in issues to be assigned to users is often
"just create a pull request". That's in contradiction to the
"introductory issue" instructions posted by the GitHub bot.

This change updates the instructions, mentioning the shortcut of "just
creating a PR". Moreover, it now explains linking PRs to issues in order
to close them automatically upon merge.

Author: SimplyDanny

llvm/utils/git/github-automation.py

@@ -24,12 +24,13 @@
 
 This issue may be a good introductory issue for people new to working on LLVM. If you would like to work on this issue, your first steps are:
 
-1. In the comments of the issue, request for it to be assigned to you.
-2. Fix the issue locally.
-3. [Run the test suite](https://llvm.org/docs/TestingGuide.html#unit-and-regression-tests) locally. Remember that the subdirectories under `test/` create fine-grained testing targets, so you can e.g. use `make check-clang-ast` to only run Clang's AST tests.
-4. Create a Git commit.
-5. Run [`git clang-format HEAD~1`](https://clang.llvm.org/docs/ClangFormat.html#git-integration) to format your changes.
-6. Open a [pull request](https://github.com/llvm/llvm-project/pulls) to the [upstream repository](https://github.com/llvm/llvm-project) on GitHub. Detailed instructions can be found [in GitHub's documentation](https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/creating-a-pull-request).
+1. Check that no other contributor has already been assigned to this issue. If you believe that no one is actually working on it despite an assignment, ping the person. After one week without a response, the assignee may be changed.
+1. In the comments of this issue, request for it to be assigned to you, or just create a [pull request](https://github.com/llvm/llvm-project/pulls) after following the steps below. [Mention](https://docs.github.com/en/issues/tracking-your-work-with-issues/linking-a-pull-request-to-an-issue) this issue in the description of the pull request.
+1. Fix the issue locally.
+1. [Run the test suite](https://llvm.org/docs/TestingGuide.html#unit-and-regression-tests) locally. Remember that the subdirectories under `test/` create fine-grained testing targets, so you can e.g. use `make check-clang-ast` to only run Clang's AST tests.
+1. Create a Git commit.
+1. Run [`git clang-format HEAD~1`](https://clang.llvm.org/docs/ClangFormat.html#git-integration) to format your changes.
+1. Open a [pull request](https://github.com/llvm/llvm-project/pulls) to the [upstream repository](https://github.com/llvm/llvm-project) on GitHub. Detailed instructions can be found [in GitHub's documentation](https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/creating-a-pull-request). [Mention](https://docs.github.com/en/issues/tracking-your-work-with-issues/linking-a-pull-request-to-an-issue) this issue in the description of the pull request.
 
 If you have any further questions about this issue, don't hesitate to ask via a comment in the thread below.
 """