Change documentation references from OS X to macOS (#1927)

Since OS X 10.12 it has been named macOS so it makes sense
to reference it in documentation as such, even when it
sometimes refers to older versions which were called (Mac) OS X.

interface/wx/listctrl.h

@@ -588,7 +588,7 @@ public:
         Returns @NULL if no label is being edited.
 
         @note It is currently only implemented for wxMSW and the generic version,
-              not for the native OS X version.
+              not for the native macOS version.
     */
     wxTextCtrl* GetEditControl() const;