[llvm] Fix #65890: Update the bot message to use github pull requests (PR #65914)

[Danny Mösch via llvm-commits]

================
@@ -23,17 +23,15 @@
 
 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
----------------
SimplyDanny wrote:

```suggestion
  4) Create a Git commit.
```

https://github.com/llvm/llvm-project/pull/65914