Update dc_motor_pi.md

Author: ValentinKaisermayer

docs/src/tutorials/dc_motor_pi.md

@@ -42,12 +42,12 @@ The actual model can now be composed.
 connections = [connect(fixed.flange, emf.support, friction.flange_b)
                connect(emf.flange, friction.flange_a, inertia.flange_a)
                connect(inertia.flange_b, load.flange)
-               connect(inertia.flange_b, speed_sensor.flange_a)
+               connect(inertia.flange_b, speed_sensor.flange)
                connect(load_step.output, load.tau)
                connect(ref.output, feedback.input1)
-               connect(speed_sensor.w_rel, feedback.input2)
+               connect(speed_sensor.w, feedback.input2)
                connect(feedback.output, pi_controller.err_input)
-               connect(pi_controller.ctr_output, source.input)
+               connect(pi_controller.ctr_output, source.V)
                connect(source.p, R1.p)
                connect(R1.n, L1.p)
                connect(L1.n, emf.p)
@@ -90,4 +90,4 @@ Plots.plot(p1, p2, layout = (2, 1))
 nothing # hide
 ```
 
-![DC Motor with speed controller](dc_motor_pi.png)
+![DC Motor with speed controller](dc_motor_pi.png)