doc: Update doc versions in nrfxlib for 3.3.0

Updated doc versions in nrfxlib for 3.3.0

NCSDK-38562

Signed-off-by: Richa Pandey <richa.pandey@nordicsemi.no>

Author: richabp

mpsl/CHANGELOG.rst

@@ -10,8 +10,8 @@ Changelog
 
 All the notable changes to this project are documented on this page.
 
-Main branch
-***********
+nRF Connect SDK v3.3.0
+**********************
 
 Added
 =====

nrf_802154/doc/CHANGELOG.rst

@@ -10,8 +10,8 @@ Changelog
 All notable changes to this project are documented in this file.
 See also :ref:`nrf_802154_limitations` for permanent limitations.
 
-Main branch - nRF 802.15.4 Radio Driver
-***************************************
+nRF Connect SDK v3.3.0 - nRF 802.15.4 Radio Driver
+**************************************************
 
 Added
 =====

nrf_fuel_gauge/CHANGELOG.rst

@@ -9,8 +9,8 @@ Changelog
 
 All notable changes to this project are documented on this page.
 
-Main branch
-***********
+nRF Connect SDK v3.3.0
+**********************
 
 Changes
 =======

nrf_modem/doc/CHANGELOG.rst

@@ -9,8 +9,8 @@ Changelog
 
 All notable changes to this project are documented in this file.
 
-nrf_modem
-*********
+nrf_modem 3.3.0
+***************
 
 The library is now released in three variants, with different feature sets and support for different variants of the nRF91 Series firmware.
 

softdevice_controller/CHANGELOG.rst

@@ -9,8 +9,8 @@ Changelog
 
 All the notable changes to this project are documented on this page.
 
-Main branch
-***********
+nRF Connect SDK v3.3.0
+**********************
 
 Added
 =====
@@ -42,6 +42,7 @@ Bug fixes
 * Fixed an issue where the controller could generate one too many HCI LE CS Subevent Result events for a CS procedure. (DRGN-27538)
 
   The issue would only happen if all the following conditions are met:
+
     * The CS procedure terminates due to running out of channels, based on the configured channel map and channel map repetition.
     * The configured duration of the last CS subevent in the CS procedure is just enough to fit all the remaining CS steps.