doc: release: Add information on UART over Bluetooth LE and NUS Service

Add documentation on relevant sections to list addition of Bluetooth LE
service NUS (Nordic UART Service), as well as the UART driver for UART
over Bluetooth LE and snippets to easily enable it.

Signed-off-by: Luis Ubieda <luisf@croxel.com>

doc/releases/release-notes-3.7.rst

@@ -37,6 +37,10 @@ Architectures
 Bluetooth
 *********
 
+  * Added Nordic UART Service (NUS), enabled by the :kconfig:option:`CONFIG_BT_NUS`.
+    This Service exposes the ability to declare multiple instances of the GATT service,
+    allowing multiple serial endpoints to be used for different purposes.
+
 Boards & SoC Support
 ********************
 
@@ -147,6 +151,10 @@ Drivers and Sensors
 
 * Serial
 
+  * Added driver to support UART over Bluetooth LE using NUS (Nordic UART Service). This driver
+    enables using Bluetooth as a transport to all the subsystems that are currently supported by
+    UART (e.g: Console, Shell, Logging).
+
 * SPI
 
 * USB
@@ -213,3 +221,8 @@ LVGL
 
 Tests and Samples
 *****************
+
+  * Added snippet for easily enabling UART over Bluetooth LE by passing ``-S nus-console`` during
+    ``west build``. This snippet sets the :kconfig:option:`CONFIG_BT_NUS_AUTO_START_BLUETOOTH`
+    which allows non-Bluetooth samples that use the UART APIs to run without modifications
+    (e.g: Console and Logging examples).