[issue13763] rm obsolete reference in devguide

[Sandro Tosi]

Sandro Tosi <sandro.tosi at gmail.com> added the comment:

But we may explain what's behind: "after the mercury chemical element symbol" - what do you think?

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nosy: +sandro.tosi
stage:  -> patch review

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue13763>
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