[docs] [issue17415] Clarify docs of os.path.normpath()

[Terry J. Reedy]

Terry J. Reedy added the comment:

If foo is a symbolic link,  changing A/foo/../B to A/B could change the meaning, so I am sure the rewrite is correct. I used Ezio's version with a few more changes. I particular, I changed 'This collapsing', which is slightly awkward anyway, to 'This string manipulation', which addresses Gurmeet's last comment.

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resolution:  -> fixed

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<http://bugs.python.org/issue17415>
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