L2SS-261: Fixed spelling in warning message.

devices/devices/sdp/sst.py

@@ -135,7 +135,7 @@ class SST(hardware_device):
         try:
             self.opcua_connection.stop()
         except Exception as e:
-            self.warn_stream("Exception while stopping OPC ua connection in configure_for_off function: {}. Exception ignored".format(e))
+            self.warn_stream("Exception while stopping OPC UA connection in configure_for_off function: {}. Exception ignored".format(e))
 
     @log_exceptions()
     def configure_for_initialise(self):