📝 Add rubric header for table note section

Author: shnizzedy

docs/_sources/user/func.rst

@@ -81,6 +81,8 @@ For each filter, ``Name`` need not be provided; if ``Name`` is not provided, it
 
 and the format ``{filterType}{filterOrder}[{key}{value}]*`` with a lowercase ``p`` replacing any decimal points. If any filters have duplicate names (given or generated), each name after the first will be suffixed with ``dup{duplicate_number}``, with ``duplicate_number`` starting at 1. See :py:func:`CPAC.pipeline.schema.name_motion_filter` for examples.
 
+.. rubric:: Note about abbreviation table
+
 .. [#motion-filter-abbreviations] These abbreviations are based on :cite:`motionfilt-Eybe16` but modified to comply with :cite:`motionfilt-BIDS21`.
 
 .. rubric:: References