[docs] [issue19981] Typo in mailbox documentation

[Roundup Robot]

Roundup Robot added the comment:

New changeset 31fd129960d5 by Ezio Melotti in branch '2.7':
#19981: fix typo in email.mailbox docs.  Patch by Claudiu Popa.
http://hg.python.org/cpython/rev/31fd129960d5

New changeset 364ca376956f by Ezio Melotti in branch '3.3':
#19981: fix typo in email.mailbox docs.  Patch by Claudiu Popa.
http://hg.python.org/cpython/rev/364ca376956f

New changeset 0d8fe7d688a9 by Ezio Melotti in branch 'default':
#19981: merge with 3.3.
http://hg.python.org/cpython/rev/0d8fe7d688a9

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nosy: +python-dev

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