man page writer could highlight .. rubric

[anntzer]

This feature request was reported as a subpart of bug report #6331; the bug has been fixed but the feature request remains.

Is your feature request related to a problem? Please describe.

The man page writer doesn't highlight .. rubric::, even though it highlights the (somewhat) similar .. topic::.

Example:

$ sphinx-quickstart -q -pfoo -afoo

edit index.rst to add

.. rubric:: Rubric

.. topic:: Topic

   This.

then

$ make man
$ man _build/man/foo.1

Describe the solution you'd like
.. rubric:: get highlighted by the man page writer, e.g. like .. topic::.

Describe alternatives you've considered
n/a