remove @ingroup; use @category instead

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@52498 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/dc.h

@@ -8,7 +8,6 @@
 
 /**
     @class wxDC
-    @ingroup group_class_dc group_class_gdi
     @wxheader{dc.h}
 
     A wxDC is a @e device context onto which graphics and text can be drawn.
@@ -29,7 +28,7 @@
     them.
 
     @library{wxcore}
-    @category{dc}
+    @category{dc,gdi}
 
     @see Overview()
 */
@@ -978,7 +977,6 @@ public:
 
 /**
     @class wxDCClipper
-    @ingroup group_class_gdi
     @wxheader{dc.h}
 
     wxDCClipper is a small helper class for setting a clipping region on a