Doc: replace Mac OS X with OS X

Task-number: QTBUG-40759
Change-Id: I11b3aa74d35064371cbbbeba660114e086b16aea
Reviewed-by: Martin Smith <martin.smith@digia.com>
Reviewed-by: Topi Reiniö <topi.reinio@digia.com>

src/multimedia/audio/qaudiosystemplugin.cpp

@@ -66,7 +66,7 @@ QAudioSystemFactoryInterface::~QAudioSystemFactoryInterface()
 
     \sa QAbstractAudioDeviceInfo, QAbstractAudioOutput, QAbstractAudioInput
 
-    Qt supports win32, linux(alsa) and Mac OS X standard (builtin to the
+    Qt supports win32, linux(alsa) and OS X standard (builtin to the
     QtMultimedia library at compile time).
 
     You can support other backends other than these predefined ones by

src/multimedia/doc/src/qtmultimedia-examples.qdoc

@@ -32,6 +32,6 @@
     \brief Demonstrates the multimedia functionality provided by Qt.
 
     The \l{Qt Multimedia} module provides low-level audio support on Linux,
-    Windows and Mac OS X. It also provides audio plugin API to allow developers
+    Windows and OS X. It also provides audio plugin API to allow developers
     implement their own audio support for custom devices and platforms.
 */

src/multimedia/video/qabstractvideobuffer.cpp

@@ -92,7 +92,7 @@ int QAbstractVideoBufferPrivate::map(
     \value NoHandle The buffer has no handle, its data can only be accessed by mapping the buffer.
     \value GLTextureHandle The handle of the buffer is an OpenGL texture ID.
     \value XvShmImageHandle The handle contains pointer to shared memory XVideo image.
-    \value CoreImageHandle The handle contains pointer to Mac OS X CIImage.
+    \value CoreImageHandle The handle contains pointer to OS X CIImage.
     \value QPixmapHandle The handle of the buffer is a QPixmap.
     \value EGLImageHandle The handle of the buffer is an EGLImageKHR.
     \value UserHandle Start value for user defined handle types.