doc: changelog: fast_pair: merge duplicated Fast Pair library section

Updated the release changelog to remove the duplicated sections for the
Fast Pair library changelog.

Signed-off-by: Kamil Piszczek <[email protected]>

Author: kapi-no

doc/nrf/releases_and_maturity/releases/release-notes-changelog.rst

@@ -760,6 +760,7 @@ Bluetooth libraries and services
 
   * Updated:
 
+    * The :c:func:`bt_fast_pair_info_cb_register` API to allow registration of multiple callbacks.
     * The Fast Pair sysbuild Kconfig options.
       The ``SB_CONFIG_BT_FAST_PAIR`` Kconfig option is replaced with the ``SB_CONFIG_BT_FAST_PAIR_MODEL_ID`` and ``SB_CONFIG_BT_FAST_PAIR_ANTI_SPOOFING_PRIVATE_KEY``.
     * The method of supplying the Fast Pair Model ID and Anti-Spoofing Private Key to generate the Fast Pair provisioning data HEX file.
@@ -776,11 +777,6 @@ Bluetooth libraries and services
 
   * Fixed an issue in the :ref:`bt_mesh_light_ctrl_srv_readme` model to automatically resume the Lightness Controller after recalling a scene (``NCSDK-30033`` known issue).
 
-
-* :ref:`bt_fast_pair_readme` library:
-
-  * Updated the :c:func:`bt_fast_pair_info_cb_register` API to allow registration of multiple callbacks.
-
 Common Application Framework
 ----------------------------