[docs] [issue26248] Improve scandir DirEntry docs, especially re symlinks and caching

[STINNER Victor]

STINNER Victor added the comment:

Ben Hoyt added the comment:
> Seeing this has been merged (thanks Victor), can this issue be closed?

As I wrote, I left the issue open for wait for feedback. I know that
some people to read the doc online:
https://docs.python.org/dev/library/os.html#os.DirEntry

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<http://bugs.python.org/issue26248>
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