📝💅 Split trivial change log category into 3

The new change note types are `packaging`, `contrib` and `misc`.
`packaging` is intended for the audience of downstream redistributors.
The `contrib` notes are meant to be documenting news affecting the
project contributors, their development, and processes.
Finally, `misc` is for things that don't fit anywhere but are still
desired to be documented for some reason.

changelog/README.rst

@@ -20,10 +20,22 @@ Each file should be named like ``<ISSUE>.<TYPE>.rst``, where
 * ``deprecation``: feature deprecation.
 * ``breaking``: a change which may break existing suites, such as feature removal or behavior change.
 * ``vendor``: changes in packages vendored in pytest.
-* ``trivial``: fixing a small typo or internal change that might be noteworthy.
+* ``packaging``: notes for downstreams about unobvious side effects
+  and tooling. changes in the test invocation considerations and
+  runtime assumptions.
+* ``contrib``: stuff that affects the contributor experience. e.g.
+  Running tests, building the docs, setting up the development
+  environment.
+* ``misc``: changes that are hard to assign to any of the above
+  categories.
 
 So for example: ``123.feature.rst``, ``456.bugfix.rst``.
 
+.. tip::
+
+   See :file:`pyproject.toml` for all available categories
+   (``tool.towncrier.type``).
+
 If your PR fixes an issue, use that number here. If there is no issue,
 then after you submit the PR and get the PR number you can add a
 changelog using that instead.

pyproject.toml

@@ -414,9 +414,23 @@ name = "Improved documentation"
 showcontent = true
 
 [[tool.towncrier.type]]
-# Changes that might not even be worth exposing to the end users.
-directory = "trivial"
-name = "Trivial/internal changes"
+# Notes for downstreams about unobvious side effects and tooling. Changes
+# in the test invocation considerations and runtime assumptions.
+directory = "packaging"
+name = "Packaging updates and notes for downstreams"
+showcontent = true
+
+[[tool.towncrier.type]]
+# Stuff that affects the contributor experience. e.g. Running tests,
+# building the docs, setting up the development environment.
+directory = "contrib"
+name = "Contributor-facing changes"
+showcontent = true
+
+[[tool.towncrier.type]]
+# Changes that are hard to assign to any of the above categories.
+directory = "misc"
+name = "Miscellaneous internal changes"
 showcontent = true
 
 [tool.mypy]