[docs] [issue15956] backreference to named group does not work

[Roundup Robot]

Roundup Robot added the comment:

New changeset f765a29309d1 by Georg Brandl in branch '3.3':
Closes #15956: improve documentation of named groups and how to reference them.
http://hg.python.org/cpython/rev/f765a29309d1

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<http://bugs.python.org/issue15956>
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