bpo-26656: Add a reference link to the regular expression objects

[elenaoat]

As per http://bugs.python.org/issue26656

https://bugs.python.org/issue26656

[the-knights-who-say-ni]

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[Mariatta]

Thanks for the PR, @elenaoat. However, someone else has already worked on it. I have accepted the PR that came earlier, so I'm closing this.