[docs] [issue12714] argparse.ArgumentParser.add_argument() documentation error

[R. David Murray]

R. David Murray <rdmurray at bitdance.com> added the comment:

"optionals only" means the same thing as "options only", but 'optionals' is what argparse calls them (as contrasted with positionals).

'optionals' is only used two places in the doc and isn't defined, but its meaning is implied by the section heading ("optional arguments").

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<http://bugs.python.org/issue12714>
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