doc: Reflect renaming of Mac OS X to OS X

Peter Eisentraut <peter_e@gmx.net>

Commit: 18af7938c1efa1ad18c876fcc471020c0ad9db07
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2014-09-09T17:58:50Z
Releases: 9.4.0
doc: Reflect renaming of Mac OS X to OS X

bug #10528

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