pybricks.common.Motor: Document when settings take effect.

This updates how and when settings take effect. In this release, you can
change them even while the motor is moving. Some settings do not
take effect right away, as now indicated in the relevant methods.

See also https://github.com/pybricks/pybricks-api/issues/105

doc/main/pupdevices/motor.rst

@@ -64,10 +64,6 @@ Motors with rotation sensors
 
     .. rubric:: Control settings
 
-    You can only change these settings while the controller is stopped. For
-    example, you can change them at the start of your program. Alternatively,
-    first call :meth:`stop() <pybricks.pupdevices.Motor.stop>`, and then change the settings.
-
     .. automethod:: pybricks.pupdevices.Motor.control.limits
 
     .. automethod:: pybricks.pupdevices.Motor.control.pid

src/pybricks/_common.py

@@ -199,6 +199,9 @@ class Control:
 
         If no arguments are given, this will return the current values.
 
+        The new ``acceleration`` and ``speed`` limit will become effective
+        when you give a new motor command. Ongoing maneuvers are not affected.
+
         Arguments:
             speed (Number, deg/s or Number, mm/s):
                 Maximum speed. All speed commands will be capped to this value.