Comment in xml changed

src/xml/nav_main_tree.xml

@@ -8,7 +8,7 @@
             <Action ID="get_current_status_nav" status_code="{NAV_BT_status_out}"/>
             <!-- If navigation fails we stop the movement of the robot -->
             <Action ID="sync_stop_nav"/>
-            <!-- We are not stopping until the navigation really stops -->
+            <!-- We are not waiting until the navigation really stops -->
           </Sequence>
         </ForceFailure>
       </Fallback>