[docs] [issue12350] Improve stat_result.st_blocks and st_blksize documentation

[Roundup Robot]

Roundup Robot added the comment:

New changeset c32657e278f6 by Georg Brandl in branch '2.7':
Closes #12350: clarify blocks/block size members of stat result.
http://hg.python.org/cpython/rev/c32657e278f6

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