Added explicit information about which functions and macros are declared in what headers from last commit.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@52602 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/image.h

@@ -1475,6 +1475,8 @@ public:
     see wxImage.
 
     @see wxImage, wxImageHandler
+
+    @header{wx/image.h}
 */
 void wxInitAllImageHandlers();