fix: options formatter for manpages (#50)

The "options" formatter for the manpage generation did not output any
option, as the loop used a wrong key in the parser_info dictionary
(likely a typo).

This patch fixes this, which results in correctly printed parser options
in manpage mode.

Author: fmoessbauer

sphinxarg/ext.py

@@ -326,7 +326,7 @@ def _construct_manpage_specific_structure(self, parser_info):
             options_section += nodes.subtitle(text='Positional arguments:')
             options_section += self._format_positional_arguments(parser_info)
         for action_group in parser_info['action_groups']:
-            if 'options' in parser_info:
+            if 'options' in action_group:
                 options_section += nodes.paragraph()
                 options_section += nodes.subtitle(text=action_group['title'])
                 options_section += self._format_optional_arguments(action_group)