The same document states that "repmgr 5.5.0 is compatible with all
supported PostgreSQL versions from 13.x", so 12 shouldn't be listed in
the matrix.
Moreover, 14 is missing in 5.5 and 5.4.1, which looks like an accidental
omission that might have happened when support for 15 was added on a
version that only advertized 13 up to that point. 14 should have been
added along with 15 then.
This should be used wherever we need to show the latest release
date.
Don't use this in the release notes however, as it will be easy to
forget to update it when adding notes for a new release.
Use &repmgrversion; entity to generate the current version number and
prevent document bitrot.
Also define a "release-current" ID attribute for ease of linking to
the current release notes.
Per notification from the mailing list.
