[docs] [issue29092] Sync os.stat's doc and doc string

[Xiang Zhang]

Changes by Xiang Zhang <angwerzx at 126.com>:


----------
resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29092>
_______________________________________