minimal improvement of Document documentation

src/App/Document.h

@@ -361,6 +361,7 @@ protected:
     /// callback from the Document objects after property was changed
     void onChangedProperty(const DocumentObject *Who, const Property *What);
     /// helper which Recompute only this feature
+    /// @return True if the recompute process of the Document shall be stopped, False if it shall be continued.
     bool _recomputeFeature(DocumentObject* Feat);
     void _clearRedos();