add doc strings to commands missing them

Change-Id: Ib0320cc4653ff695a7ee2bad3486eeec5309d3b1

secop_psi/sea.py

@@ -651,4 +651,9 @@ class SeaDrivable(SeaModule, Drivable):
 
     @Command()
     def stop(self):
+        """propagate to SEA
+
+        - on stdsct drivables this will call the halt script
+        - on EaseDriv this will set the stopped state
+        """
         self._iodev.query('%s is_running 0' % self.sea_object)