samples: ble_nus_central: use button 1 to disconnect from peripheral

Updated to use button 1 to disconnect from target peripheral to align
with other central samples.

Signed-off-by: Andreas Moltumyr <andreas.moltumyr@nordicsemi.no>

Author: anhmolt

doc/nrf-bm/release_notes/release_notes_changelog.rst

@@ -122,6 +122,10 @@ Bluetooth LE samples
       * The allow list disabling button to only trigger on button press, and not on button release.
       * An issue with the endianness of the target peripheral address when displaying the address on a :c:macro:`BLE_SCAN_EVT_CONNECTED` event and when supplying scan filter address with the :kconfig:option:`CONFIG_SAMPLE_TARGET_PERIPHERAL_ADDR` Kconfig option.
 
+* :ref:`ble_nus_central_sample` sample:
+
+   * Updated to use button 1 to disconnect from target peripheral to align with other central samples.
+
 NFC samples
 -----------
 

samples/bluetooth/ble_nus_central/README.rst

@@ -44,7 +44,7 @@ In addition, the sample enables peer TX notifications to receive data from the p
 User interface
 **************
 
-Button 3:
+Button 1:
    Press to disconnect from the connected peer device.
 
 LED 0:

samples/bluetooth/ble_nus_central/src/main.c

@@ -450,7 +450,7 @@ static int buttons_leds_init(void)
 
 	static struct bm_buttons_config btn_configs[] = {
 		{
-			.pin_number = BOARD_PIN_BTN_3,
+			.pin_number = BOARD_PIN_BTN_1,
 			.active_state = BM_BUTTONS_ACTIVE_LOW,
 			.pull_config = BM_BUTTONS_PIN_PULLUP,
 			.handler = button_disconnect_handler,