[docs] [issue16240] Document a way to escape metacharacters in glob/fnmatch

[Fred L. Drake, Jr.]

Fred L. Drake, Jr. added the comment:

Better (IMO):

Wrap the meta-characters in brackets for a literal match.  For example, ``'[?]'`` matches the character ``'?'``.

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nosy: +fdrake

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<http://bugs.python.org/issue16240>
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