doc: 2.3 relnotes: Add section for API changes, document AE ones

Add a section in the 2.3 release notes for the API changes, and document
the ones introduced by the Advertising Extensions support in the BLE
Host.

Signed-off-by: Carles Cufi <[email protected]>

Author: carlescufi

doc/releases/release-notes-2.3.rst

@@ -18,6 +18,30 @@ Security Vulnerability Related
 
 No security vulnerabilities received.
 
+API Changes
+***********
+
+Deprecated in this release
+==========================
+
+* Bluetooth
+
+  * BT_LE_SCAN_FILTER_DUPLICATE, use BT_LE_SCAN_OPT_FILTER_DUPLICATE instead
+  * BT_LE_SCAN_FILTER_WHITELIST, use BT_LE_SCAN_OPT_FILTER_WHITELIST instead
+  * bt_le_scan_param::filter_dup, use bt_le_scan_param::options instead
+  * bt_conn_create_le(), use bt_conn_le_create() instead
+  * bt_conn_create_auto_le(), use bt_conn_le_create_auto() instead
+  * bt_conn_create_slave_le(), use bt_conn_le_create_slave() instead
+  * BT_LE_ADV_* macros, use BT_HCI_ADV_* macros instead
+
+Removed APIs in this release
+============================
+
+
+Stable API changes in this release
+==================================
+
+
 Kernel
 ******