added comments clarifying the code a bit

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@37792 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/xrc/xh_bmp.cpp

@@ -29,6 +29,8 @@ wxBitmapXmlHandler::wxBitmapXmlHandler()
 
 wxObject *wxBitmapXmlHandler::DoCreateResource()
 {
+    // NB: empty parameter name means "take directly from this node's next
+    //     instead of from subnode with given name"
     return new wxBitmap(GetBitmap(wxEmptyString));
 }
 
@@ -46,6 +48,8 @@ wxIconXmlHandler::wxIconXmlHandler()
 
 wxObject *wxIconXmlHandler::DoCreateResource()
 {
+    // NB: empty parameter name means "take directly from this node's next
+    //     instead of from subnode with given name"
     return new wxIcon(GetIcon(wxEmptyString));
 }