[docs] [issue15724] Add "versionchanged" to memoryview docs

[Roundup Robot]

Roundup Robot added the comment:

New changeset 144d649764cf by Stefan Krah in branch 'default':
Issue #15724: Add versionchanged tags to the memoryview documentation.
http://hg.python.org/cpython/rev/144d649764cf

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<http://bugs.python.org/issue15724>
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