[docs] [issue28107] Update typing module documentation for NamedTuple

[Roundup Robot]

Roundup Robot added the comment:

New changeset 78c0487562d9 by Guido van Rossum in branch '3.6':
Issue #28107: Update typing module documentation for NamedTuple (Ivan)
https://hg.python.org/cpython/rev/78c0487562d9

New changeset 709b19b9d6ea by Guido van Rossum in branch 'default':
Issue #28107: Update typing module documentation for NamedTuple (Ivan) (3.6->3.7)
https://hg.python.org/cpython/rev/709b19b9d6ea

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nosy: +python-dev

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