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

[Nick Coghlan]

Nick Coghlan added the comment:

Just a heads up that I'm about to check in a fairly major change to the sequence docs layout. I'm leaving the memoryview block alone, so hopefully this won't cause you any problems, but there's going to be a merge in your future :)

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nosy: +ncoghlan

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