[llvm] Update the developer policy information on "Stay Informed" to refer to GitHub teams (PR #65798)

[Tom Stellard via llvm-commits]

================
@@ -46,21 +46,33 @@ quality.
 Stay Informed
 -------------
 
-Developers should stay informed by reading the `LLVM Discourse forums`_.
-If you are doing anything more than just casual work on LLVM, it is suggested that you also
-subscribe to the "commits" mailing list for the subproject you're interested in,
+Developers should stay informed by reading the `LLVM Discourse forums`_ and subscribing
+to the categories of interest for notifications.
+
+Paying attention to changes being made by others is a good way to see what other people
+are interested in and watching the flow of the project as a whole.
+
+Contibutions to the project are made through :ref:`GitHub Pull Requests <github-reviews>`.
+You can subscribe to notification for areas of the codebase by joining
+one of the `pr-subscribers-* <https://github.com/orgs/llvm/teams?query=issue-subscribers>`_
----------------
tstellar wrote:

This query should be pr-subscribers, not issue-subscribers.

https://github.com/llvm/llvm-project/pull/65798