[docs] [issue29371] Typo in doctest documentation

[Roundup Robot]

Roundup Robot added the comment:

New changeset 3fd198b80f29 by Mariatta Wijaya in branch '2.7':
Issue #29371: Clarify bitwise OR operation in doctest option flags.
https://hg.python.org/cpython/rev/3fd198b80f29

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29371>
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