[docs] [issue22594] Add a link to the regex module in re documentation

[Marco Buttu]

Marco Buttu added the comment:

Looking at the regex module and documentation, it is not clear to me whether its API behaves exactly as the re API. In addition, being a third-party module, things can change in the future.

To be defensive, IMO it is better to write as in the Ezio comment (in the review): "mostly compatible API". I propose a shorter patch, that adds the reference at the beginning of the page (right after the module introcution).

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Added file: http://bugs.python.org/file46561/regex_reference.patch

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