remove unused signals

src/document/UBDocumentContainer.h

@@ -58,8 +58,6 @@ class UBDocumentContainer : public QObject
 
     signals:
         void documentSet(UBDocumentProxy* document);
-//        void documentPageAdded(int index);
-//        void documentPageDeleted(int index);
         void documentPageUpdated(int index);
         void documentThumbnailsUpdated(UBDocumentContainer* source);
 };