[docs] [issue21221] Minor struct_time documentation bug

[Roundup Robot]

Roundup Robot added the comment:

New changeset f7324e5935f8 by Senthil Kumaran in branch '2.7':
Backport doc improvements for Issue21221 - Explain the usage of tm_isdst
https://hg.python.org/cpython/rev/f7324e5935f8

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21221>
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