Consider wxOSX the port name, and have wxOSX/Carbon and wxOSX/Cocoa as variations, so that linkages from function docs are left intact. Also, do a little cleanup and elaborate more in the docs for OS X Cocoa and OS X Carbon.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@59545 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/icon.h

@@ -94,7 +94,7 @@ public:
         @param height
             The height of the image.
 
-        @onlyfor{wxmsw,wxmac}
+        @onlyfor{wxmsw,wxosx}
     */
     wxIcon(const char bits[], int width, int height);