[docs] [issue25519] Minor difflib documentation bug

[Roundup Robot]

Roundup Robot added the comment:

New changeset 4ed175ee3cca by Terry Jan Reedy in branch '2.7':
Issue #25519: Mark difflib.ndiff as a functions where not already.
https://hg.python.org/cpython/rev/4ed175ee3cca

New changeset b7686cb0b698 by Terry Jan Reedy in branch '3.4':
Issue #25519: Mark difflib.ndiff as a functions where not already.
https://hg.python.org/cpython/rev/b7686cb0b698

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nosy: +python-dev

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