[docs] [issue21977] In the re's token example OP and SKIP regexes can be improved

[Raymond Hettinger]

Raymond Hettinger added the comment:

I will keep the \- because the - at the front of the character range is a non-obvious special case.  The other changes look reasonable.

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priority: normal -> low
stage:  -> commit review
type: enhancement -> performance
versions: +Python 2.7, Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21977>
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