[issue20448] Adds missing backslash to devguide setup page

[Roundup Robot]

Roundup Robot added the comment:

New changeset 7d95a62513ce by Zachary Ware in branch 'default':
Issue #20448: Escape backslashes.  Caught by Saimadhav Heblikar.
http://hg.python.org/devguide/rev/7d95a62513ce

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nosy: +python-dev

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20448>
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