doc: migration-guide: 4.2: add migration guide entry for enable

- Add migration guide entry for enable->enable/disable function
- Add stepper_disable to stepper.rst

Signed-off-by: Jilay Pandya <jilay.pandya@outlook.com>

doc/hardware/peripherals/stepper.rst

@@ -14,6 +14,7 @@ Configure Stepper Driver
   and :c:func:`stepper_get_actual_position`.
 - Set **step interval** in nanoseconds between steps using :c:func:`stepper_set_microstep_interval`
 - **Enable** the stepper driver using :c:func:`stepper_enable`.
+- **Disable** the stepper driver using :c:func:`stepper_disable`.
 
 Control Stepper
 ===============

doc/releases/migration-guide-4.2.rst

@@ -196,6 +196,12 @@ Modem
   :kconfig:option:`CONFIG_MODEM_CMUX_WORK_BUFFER_SIZE` and :kconfig:option:`CONFIG_MODEM_CMUX_MTU`.
 
 
+Stepper
+=======
+
+* Refactored the ``stepper_enable(const struct device * dev, bool enable)`` function to
+  :c:func:`stepper_enable` & :c:func:`stepper_disable`.
+
 Bluetooth
 *********
 

drivers/stepper/allegro/a4979.c

@@ -76,7 +76,6 @@ static int a4979_stepper_enable(const struct device *dev)
 
 static int a4979_stepper_disable(const struct device *dev)
 {
-
 	int ret;
 	const struct a4979_config *config = dev->config;
 	struct a4979_data *data = dev->data;