gpart(8) man page missing list documentation

[Chris Ross]

  Looking at the man page for gpart(8) on a recent 10-stable system, I was trying to find out what the -a option to list does.  (shown in the output of gpart when run with no parameters).  Interestingly, despite “list” being highlighted in paragraph text as an action for the command, it does not appear in the summary at the top of the page, nor in the detailed DESCRIPTION section that describes each of the actions.

  This appears to still be the case on HEAD, as well.  I assume this is worth fixing and MFC’ing?

  Thanks.

                         - Chris