Refresh the PULL_REQUEST_TEMPLATE

Author: AA-Turner

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,19 +1,33 @@
-Subject: <short purpose of this pull request>
+<!--
+Thank you for creating this pull request and for spending time to help Sphinx!
+Our contributors' guide can be found online: https://www.sphinx-doc.org/en/master/internals/contributing.html
+Ask any questions at https://github.com/sphinx-doc/sphinx/discussions
+-->
 
-### Feature or Bugfix
-<!-- please choose -->
-- Feature
-- Bugfix
-- Refactoring
 
-### Purpose
-- <long purpose of this pull request>
-- <Environment if this PR depends on>
+## Purpose
 
-### Detail
-- <feature1 or bug1>
-- <feature2 or bug2>
+<!--
+A description of the purpose of this pull request.
+Ensure that all relevant information is included for reviewers,
+including any environment-specific details.
 
-### Relates
-- <URL or Ticket>
+* If you plan to add tests or documentation after opening this PR,
+  please note it here.
+* For user-visible changes, remember to add an entry to CHANGES.rst.
+* Please add your name to AUTHORS.rst if you haven't already!
+-->
 
+
+## References
+
+<!--
+Please add any relevant links here, especially including any 
+GitHub issues or Pull Requests that this PR would resolve.
+This helps to ensure that reviewers have context from
+previous discussions or decisions.
+-->
+
+- <...>
+- <...>
+- <...>