[docs] Found a bug in the os.path.join function

[Ryan McCafferty]

Hello,

I am running python v3.4.2 on a Raspberry Pi 2 running raspbian jesse. I
found what I think is a bug with the os.path.join function. When passing
multiple arguments to this function, which is usually the case, if any of
the arguments contain a leading slash, all of the arguments that come
before the one with the leading slash get truncated from the resulting path.

>>> os.path.join('a', 'b', 'c')
'a/b/c'   # this is expected
>>> os.path.join('a', '/b', 'c')
'/b/c'   # expecting a/b/c
>>> os.path.join('a', 'b', '/c')
'/c'      # expecting a/b/c
>>> os.path.join('a', '/b', '/c')
'/c'      # expecting a/b/c

​
I think this is a bug, because I believe the reasoning for these path join
functions is so users do not have to worry about which path components
contain leading or trailing slashes.

Thank you,

Ryan McCafferty
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