[GitHub] Update bot message to suggest GitHub pull requests (#65914)

Fixes #65890.

---------

Co-authored-by: Danny Mösch <[email protected]>

Author: da-viper

llvm/utils/git/github-automation.py

@@ -24,17 +24,15 @@
 
 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) Assign the issue to you.
+  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.
     3.1) 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
+  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) Submit the patch to [Phabricator](https://reviews.llvm.org/).
-    6.1) Detailed instructions can be found [here](https://llvm.org/docs/Phabricator.html#requesting-a-review-via-the-web-interface)
-
-For more instructions on how to submit a patch to LLVM, see our [documentation](https://llvm.org/docs/Contributing.html).
+  6) Open a [pull request](https://github.com/llvm/llvm-project/pulls) to the [upstream repository](https://github.com/llvm/llvm-project) on GitHub.
+    6.1) Detailed instructions can be found [here](https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/creating-a-pull-request).
 
 If you have any further questions about this issue, don't hesitate to ask via a comment on this Github issue.
 """