#2 descriping third TraCI block

Author: namdre

docs/web/docs/Developer/Implementation_Notes/Simulation_Loop.md

@@ -55,6 +55,11 @@ simstep -> TraCIServer : postProcessRemoteControl
 ... -> MSVehicle : postProcessRemoteControl
 end
 
+group TraCI3 (only commands after traci.simulation.executeMove)
+simstep -> TraCIServer : processCommandsUntilSimStep
+... -> MSVehicle : getSpeed, setSpeed, ...
+end
+
 group output
 simstep -> simstep : writeOutput
 ... -> MSVehicle : getSpeed, getPosition, ...