doc: document Stop() correctly for both DPP interfaces

Stop() was separated more clearly between the two interfaces and will
now return NotFound if called on an interface that isn't currently
running.

doc/device-provisioning-api.txt

@@ -18,11 +18,9 @@ Methods		string StartEnrollee()
 
 		void Stop()
 
-			Stop an enrollee.
+			Stop an enrollee or configurator that is running.
 
-			Possible errors:	net.connman.iwd.Busy
-						net.connman.iwd.Failed
-						net.connman.iwd.InvalidArguments
+			Possible errors:	net.connman.iwd.NotFound
 
 		string StartConfigurator()
 
@@ -168,6 +166,8 @@ Object path	/net/connman/iwd/{phy0,phy1,...}/{1,2,...}
 			Calling Stop() if DPP was started via the
 			DeviceProvisioning interface will not stop it.
 
+			Possible errors:	net.connman.iwd.NotFound
+
 Properties	boolean Started [readonly]
 
 			True if shared code device provisioning is currently