[docs] [issue16760] Get rid of MatchObject in regex HOWTO

[Roundup Robot]

Roundup Robot added the comment:

New changeset 6ca8f965fd65 by Andrew Svetlov in branch '2.7':
rename MathcObject to match object in doctrings for re module (#16760)
http://hg.python.org/cpython/rev/6ca8f965fd65

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<http://bugs.python.org/issue16760>
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