doc: Update changelogs for NCS 1.6.0

Changed Master branch heading to nRF Connect SDK 1.6.0

Signed-off-by: Uma Praseeda <[email protected]>

Author: umapraseeda

nfc/CHANGELOG.rst

@@ -9,6 +9,11 @@ Changelog
 
 All notable changes to this project are documented in this file.
 
+nRF Connect SDK v1.6.0
+**********************
+
+No changes in this release.
+
 nRF Connect SDK v1.5.0
 **********************
 

nrf_802154/doc/CHANGELOG.rst

@@ -9,8 +9,8 @@ Changelog
 
 All notable changes to this project are documented in this file.
 
-Master branch - nRF 802.15.4 Radio Driver
-*****************************************
+nRF Connect SDK 1.6.0 - nRF 802.15.4 Radio Driver
+*************************************************
 
 Initial common release.
 

zboss/CHANGELOG.rst

@@ -10,8 +10,8 @@ Changelog
 All notable changes to this project in |NCS| are documented in this file.
 
 
-Master branch
-*************
+nRF Connect SDK v1.6.0
+**********************
 
 Changes
 =======
@@ -23,7 +23,7 @@ Changes
 * Extended NCP protocol with inter-PAN commands.
 * Added bootloader commands in the NCP protocol.
 * Updated the ZBOSS stack to version ``3.6.0.0+3.0.0``.
-  For detailed information, see `ZBOSS stack release notes`_ for the |NCS|'s Master branch.
+  For detailed information, see `ZBOSS stack release notes`_ for the |NCS| v1.6.0.
 
 nRF Connect SDK v1.5.1
 **********************