[docs] [issue15269] Document dircmp.left and dircmp.right

[Roundup Robot]

Roundup Robot added the comment:

New changeset 7590dec388a7 by R David Murray in branch '3.2':
#15269: document dircmp.left and right, and add tests for them.
http://hg.python.org/cpython/rev/7590dec388a7

New changeset c592e5a8fa4f by R David Murray in branch 'default':
Merge #15269: document dircmp.left and right, and add tests for them.
http://hg.python.org/cpython/rev/c592e5a8fa4f

New changeset e64d4518b23c by R David Murray in branch '2.7':
#15269: document dircmp.left and right.
http://hg.python.org/cpython/rev/e64d4518b23c

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nosy: +python-dev

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