RtlStatus.msg: fix typo

Co-authored-by: Silvan Fuhrer <[email protected]>

msg/RtlStatus.msg

@@ -3,7 +3,7 @@ uint64 timestamp                      # time since system start (microseconds)
 uint32 safe_points_id 		      # indicates updates to the safe points
 bool is_evaluation_pending 	      # flag if the RTL point needs reevaluation (e.g. new safe points available, but need loading).
 
-bool has_vtol_approach 		      # flag if approaches erse defined for current RTL_TYPE parameter setting
+bool has_vtol_approach 		      # flag if approaches are defined for current RTL_TYPE parameter setting
 
 uint8 rtl_type	      		      # Type of RTL chosen
 uint8 safe_point_index 		      # index of the chosen safe point, if in RTL_STATUS_TYPE_DIRECT_SAFE_POINT mode