small changes

com.unity.perception/Editor/GroundTruth/LabelConfigEditor.cs

             m_UiInitialized = false;
             ChangesHappeningInForeground = true;
             RefreshListDataAndPresentation();
-            Undo.undoRedoPerformed += () =>
-            {
-                ChangesHappeningInForeground = true;
-                RefreshListDataAndPresentation();
-            };
         }
 
         private int m_PreviousLabelsArraySize = -1;

com.unity.perception/Editor/GroundTruth/LabelingEditor.cs

 
             if (m_FirstItemLabelsArray.arraySize != m_PreviousLabelsArraySize)
             {
-                Debug.Log("model checker refreshing");
                 AssesAutoLabelingStatus();
                 RefreshManualLabelingData();
                 m_PreviousLabelsArraySize = m_FirstItemLabelsArray.arraySize;

com.unity.perception/Editor/GroundTruth/Uxml/LabelConfig_Main.uxml

                         style="align-self: center; padding: 10px; flex-grow:1; height: 40px; margin: 0 0 0 3"/>
             </VisualElement>
             <VisualElement class="helpbox" style="margin: 7px 0 7px 0 ">
-                <Label text="Warning:" style="color:yellow; margin-bottom: 5px"/>
-                    text="Importing labels from file will overwrite all existing contents of this label configuration."/>
+                    text="Importing a label config file will overwrite all existing contents of this label config."/>
             </VisualElement>
         </VisualElement>