[issue27216] Fix capitalisation of "Python runtime" in os.path.islink description

[Ned Deily]

Ned Deily added the comment:

Thanks for noticing!

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nosy: +ned.deily
resolution:  -> fixed
stage:  -> resolved
status: open -> closed
type: enhancement -> 
versions: +Python 3.5, Python 3.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27216>
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