[docs] [issue16589] PrettyPrinter docs is incomplete

[Roundup Robot]

Roundup Robot added the comment:

New changeset 62fed5f18681 by Ezio Melotti in branch '2.7':
#16589: fix pprint signatures in the doc (backport of 106ee4eb5970).
http://hg.python.org/cpython/rev/62fed5f18681

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nosy: +python-dev

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