Fix doc for `add_subparsers` arguments (GH-8884)

There was a missing comma.
(cherry picked from commit cc18258daf)

Co-authored-by: Anthony Sottile <asottile@umich.edu>
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Miss Islington (bot) 2018-08-23 23:22:17 -04:00 committed by GitHub
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@ -1539,7 +1539,7 @@ Sub-commands
.. method:: ArgumentParser.add_subparsers([title], [description], [prog], \
[parser_class], [action], \
[option_string], [dest], [required] \
[option_string], [dest], [required], \
[help], [metavar])
Many programs split up their functionality into a number of sub-commands,