doc: Reflect renaming of Mac OS X to OS X

Peter Eisentraut <peter_e@gmx.net>

Commit: 220bb39dee8044937a963e81be8796e99bd8508b
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2014-09-09T17:56:29Z
Releases: 9.5.0
doc: Reflect renaming of Mac OS X to OS X

bug #10528

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