[docs] [issue21221] Minor struct_time documentation bug

[Alexander Belopolsky]

Alexander Belopolsky added the comment:

> .. 0 when it is not.  -1 indicates that ..

It does not read well when the sentence starts with a number.  Consider rephrasing as "The value of -1 .." or something like that.

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