Document wxGraphicsContext::CreateBitmapFromNativeBitmap() ownership rules.

Mention that it takes ownership of the native bitmap passed to it.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@77719 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/graphics.h

@@ -1059,6 +1059,9 @@ public:
         @a bitmap meaning is platform-dependent. Currently it's a GDI+ @c
         Bitmap pointer under MSW, @c CGImage pointer under OS X or a @c
         cairo_surface_t pointer when using Cairo under any platform.
+
+        Notice that this method takes ownership of @a bitmap, i.e. it will be
+        destroyed when the returned wxGraphicsBitmap is.
      */
     virtual wxGraphicsBitmap CreateBitmapFromNativeBitmap( void* bitmap ) = 0;