[issue18021] Update broken link to Apple Publication Style Guide

[Roundup Robot]

Roundup Robot added the comment:

New changeset dcb9ec098781 by Ezio Melotti in branch 'default':
#18021: remove broken link to the Apple Style Guide.  Patch by Madison May.
http://hg.python.org/devguide/rev/dcb9ec098781

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nosy: +python-dev

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18021>
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