microbit-dal: updated comments to reflect changes to the constants.

The comments for the setServoValue member function have been updated to reflect changes in the default Range and Center from the previous commit.

inc/MicroBitPin.h

@@ -132,14 +132,14 @@ class MicroBitPin : public MicroBitComponent
 
     /**
      * Configures this IO pin as an analog/pwm output if it isn't already, configures the period to be 20ms,
-     * and sets the duty cycle between 0.05 and 0.1 (i.e. 5% or 10%) based on the value given to this method.
+     * and sets the duty cycle between 500 us and 2500 us.
      *
-     * A value of 180 sets the duty cycle to be 10%, and a value of 0 sets the duty cycle to be 5% by default.
+     * A value of 180 sets the duty cycle to be 2500us, and a value of 0 sets the duty cycle to be 500us by default.
      *
      * This range can be modified to fine tune, and also tolerate different servos.
      *
      * @param value the level to set on the output pin, in the range 0 - 180
-     * @param range which gives the span of possible values the i.e. lower and upper bounds center ± range/2 (Defaults to: MICROBIT_PIN_DEFAULT_SERVO_RANGE)
+     * @param range which gives the span of possible values the i.e. lower and upper bounds center +/- range/2 (Defaults to: MICROBIT_PIN_DEFAULT_SERVO_RANGE)
      * @param center the center point from which to calculate the lower and upper bounds  (Defaults to: MICROBIT_PIN_DEFAULT_SERVO_CENTER)
      * @return MICROBIT_OK on success, MICROBIT_INVALID_PARAMETER if value is out of range, or MICROBIT_NOT_SUPPORTED
      * if the given pin does not have analog capability.

source/MicroBitPin.cpp

@@ -159,14 +159,14 @@ int MicroBitPin::setAnalogValue(int value)
 
 /**
  * Configures this IO pin as an analog/pwm output if it isn't already, configures the period to be 20ms,
- * and sets the duty cycle between 0.05 and 0.1 (i.e. 5% or 10%) based on the value given to this method.
+ * and sets the duty cycle between 500 us and 2500 us.
  *
- * A value of 180 sets the duty cycle to be 10%, and a value of 0 sets the duty cycle to be 5% by default.
+ * A value of 180 sets the duty cycle to be 2500us, and a value of 0 sets the duty cycle to be 500us by default.
  *
  * This range can be modified to fine tune, and also tolerate different servos.
  *
  * @param value the level to set on the output pin, in the range 0 - 180
- * @param range which gives the span of possible values the i.e. lower and upper bounds center ± range/2 (Defaults to: MICROBIT_PIN_DEFAULT_SERVO_RANGE)
+ * @param range which gives the span of possible values the i.e. lower and upper bounds center +/- range/2 (Defaults to: MICROBIT_PIN_DEFAULT_SERVO_RANGE)
  * @param center the center point from which to calculate the lower and upper bounds  (Defaults to: MICROBIT_PIN_DEFAULT_SERVO_CENTER)
  * @return MICROBIT_OK on success, MICROBIT_INVALID_PARAMETER if value is out of range, or MICROBIT_NOT_SUPPORTED
  * if the given pin does not have analog capability.