update pull request template to include collapsed explanation of chan…

…ge log entry types

.github/pull_request_template.md

@@ -29,6 +29,13 @@ If this PR fixes an issue, please add closing keywords (eg 'fixes #XXX')
 
 - [ ] pre-commit checks ran successfully
 - [ ] tests ran successfully
-- [ ] for a public change, added news fragment (`changes/<PR#>.<changetype>.rst`)
+- [ ] for a public change, added <details><summary>news fragment (`changes/<PR#>.<changetype>.rst`)</summary>
+
+    - ``changes/<PR#>.feature.rst``: new feature
+    - ``changes/<PR#>.bugfix.rst``: bug fix
+    - ``changes/<PR#>.doc.rst``: documentation change
+    - ``changes/<PR#>.removal.rst``: deprecation or removal of public API
+    - ``changes/<PR#>.misc.rst``: not of interest to users; use an empty file
+  </details>
 - [ ] for a public change, updated documentation
 - [ ] for any new features, unit tests were added