[docs] [issue19639] Improve re match objects display

[Roundup Robot]

Roundup Robot added the comment:

New changeset bbfc559f7190 by Ezio Melotti in branch 'default':
#19639: update the repr of the match objects in the docs.  Patch by Claudiu Popa.
http://hg.python.org/cpython/rev/bbfc559f7190

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nosy: +python-dev

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