doc: release: Add Bluetooth ANS service to 4.4 release notes

Add Alert Notification Service (ANS) and enabling Kconfig
to 4.4 release notes.

Signed-off-by: Sean Kyer <sean.actor@gmail.com>

Author: seankyer

doc/releases/release-notes-4.4.rst

@@ -69,6 +69,12 @@ New APIs and options
   * :dtcompatible:`jedec,mspi-nor` now allows MSPI configuration of read, write and
     control commands separately via devicetree.
 
+* Bluetooth
+
+  * Services
+
+    * Introduced Alert Notification Service (ANS) :kconfig:option:`CONFIG_BT_ANS`
+
 .. zephyr-keep-sorted-stop
 
 New Boards
@@ -96,6 +102,8 @@ New Drivers
 New Samples
 ***********
 
+* :zephyr:code-sample:`ble_peripheral_ans`
+
 ..
   Same as above, this will also be recomputed at the time of the release.
  Just link the sample, further details go in the sample documentation itself.