[llvm] [Docs] Add example of making a PR with git and GitHub web interface (PR #65393)

[Tobias Hieta via llvm-commits]

================
@@ -207,6 +207,95 @@ See more in-depth information about how to contribute in the following documenta
 * :doc:`Contributing`
 * :doc:`MyFirstTypoFix`
 
+Example Pull Request with git
+====================================
+
+Instead of using the GitHub CLI to create a PR, you can push your code to a
+remote branch on your fork and create the PR to upstream using the GitHub web
+interface.
+
+Here is an example of making a PR using git and the GitHub web interface:
+
+First follow the instructions to [fork the repository](https://docs.github.com/en/get-started/quickstart/fork-a-repo?tool=webui#forking-a-repository).
+
+Next follow the instructions to [clone your forked repository](https://docs.github.com/en/get-started/quickstart/fork-a-repo?tool=webui#cloning-your-forked-repository).
+
+Once you've cloned your forked repository,
+
+::
+
+  # Switch to the forked repo
+  cd llvm-project
+
+  # Add upstream as a remote
----------------
tru wrote:

I don't think this is strictly needed. Maybe add (optional) in there.

https://github.com/llvm/llvm-project/pull/65393