Merge pull request #968 from plone/documentation-release-items

Add new and changed documentation items

[ci skip]

release/checklist.md

@@ -54,5 +54,7 @@ You probably want to wait until the Docker images are there, but don't wait long
 - [ ] Update the [release schedule](https://plone.org/download/release-schedule): note the new release, and say when the next release in this series is expected.
 - [ ] Edit the link on https://plone.org/download.
 - [ ] Announce on community.plone.org.
-- [ ] In [`plone/documentation`'s `conf.py`](https://github.com/plone/documentation/blob/6-dev/docs/conf.py#L325-L326), update `PLONE_BACKEND_PATCH_VERSION` and `PLONE_BACKEND_MINOR_VERSION` as needed. Ask Steve Piercy or do it yourself. Here is a [sample PR](https://github.com/plone/documentation/pull/1492/files).
+- [ ] In [`plone/documentation`'s `conf.py`](https://github.com/plone/documentation/blob/6.0/docs/conf.py#L440-L441), update `PLONE_BACKEND_PATCH_VERSION` and `PLONE_BACKEND_MINOR_VERSION` as needed. Ask Steve Piercy or do it yourself. Here is a [sample PR](https://github.com/plone/documentation/pull/1492/files).
+- [ ] If the supported Python versions change, then edit the entries in the `myst_substitutions` key in [`plone/documentation`'s `conf.py`](https://github.com/plone/documentation/blob/6.0/docs/conf.py#L319-L320). These replacements are used in include files at [https://github.com/plone/documentation/tree/6.0/docs/_inc](https://github.com/plone/documentation/tree/6.0/docs/_inc) with the name `_install-python-plone<##>.md` corresponding to the major and minor release number. These include files are in turn included in various parts of installation or development documentation, and should be checked to ensure the context makes sense.
+- [ ] If package names change, update the section [Packages in detail](https://6.docs.plone.org/conceptual-guides/package-dependencies.html#packages-in-detail), whose source is located at https://github.com/plone/documentation/blob/6.0/docs/conceptual-guides/package-dependencies.md.
 - [ ] Ask Philip Bauer and/or Fred van Dijk to update the demo sites.  Here is a [sample PR](https://github.com/plone/demo.plone.org/pull/15).