explicitly define change types

.github/pull_request_template.md

@@ -35,7 +35,7 @@ If this PR fixes an issue, please add closing keywords (eg 'fixes #XXX')
     - ``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
+    - ``changes/<PR#>.general.rst``: infrastructure or miscellaneous change
   </details>
 - [ ] for a public change, updated documentation
 - [ ] for any new features, unit tests were added

CONTRIBUTING.rst

@@ -62,4 +62,4 @@ to the maintainers, who are glad to assist you.
     - ``bugfix``: bug fix
     - ``doc``: documentation change
     - ``removal``: deprecation or removal of public API
-    - ``misc``: not of interest to users
+    - ``general``: infrastructure or miscellaneous change

pyproject.toml

@@ -202,3 +202,9 @@ title_format = "{version} ({project_date})"
 ignore = [".gitkeep"]
 wrap = true
 issue_format = "`#{issue} <https://github.com/asdf-format/asdf/pull/{issue}>`_"
+
+[tool.towncrier.fragment.feature]
+[tool.towncrier.fragment.bugfix]
+[tool.towncrier.fragment.doc]
+[tool.towncrier.fragment.removal]
+[tool.towncrier.fragment.general]