doc: zigbee: add github links

as requested included github links

Signed-off-by: Anna Wojdylo <[email protected]>

Author: annwoj

doc/nrf/links.txt

@@ -36,6 +36,8 @@
 .. _`RST source file of Documentation guidelines`: https://raw.githubusercontent.com/nrfconnect/sdk-nrf/main/doc/nrf/dev_model_and_contributions/documentation/styleguide.rst
 .. _`sdk-sidewalk`: https://github.com/nrfconnect/sdk-sidewalk
 .. _`Amazon Sidewalk Sample IoT App`: https://github.com/aws-samples/aws-iot-core-for-amazon-sidewalk-sample-app
+.. _`Zigbee R23 add-on repository`: https://github.com/nrfconnect/ncs-zigbee
+.. _`Zigbee R22 add-on repository`: https://github.com/nrfconnect/ncs-zigbee-r22
 .. _`sdk-zephyr`: https://github.com/nrfconnect/sdk-zephyr
 .. _`official Zephyr repository`:
 .. _`Zephyr repository`: https://github.com/zephyrproject-rtos/zephyr

doc/nrf/protocols/zigbee/index.rst

@@ -13,6 +13,6 @@ Zigbee add-ons for the |NCS| provide support for developing Zigbee applications
 These stacks are included as the ZBOSS Zigbee stack library in Zigbee add-ons repositories.
 In combination with the |NCS|, Zigbee add-ons allow for development of low-power connected solutions.
 
-For documentation, see the `Zigbee R22`_ and `Zigbee R23`_ add-ons.
+For details, see the `Zigbee R22`_ and `Zigbee R23`_ add-on documentation, or refer to their respective GitHub repositories: `R22 <Zigbee R22 add-on repository_>`_ and `R23 <Zigbee R23 add-on repository_>`_.
 
 .. include:: /includes/zigbee_deprecation.txt

doc/nrf/samples/zigbee.rst

@@ -5,6 +5,6 @@ Zigbee samples
 
 Zigbee R22 and R23 add-ons provide several samples showcasing the :ref:`ug_zigbee` protocol.
 You can build the samples for various boards and configure them for different usage scenarios.
-For documentation, see `Zigbee R22`_ or `Zigbee R23`_ add-ons.
+For details, see `Zigbee R22`_ or `Zigbee R23`_ add-ons or refer to their respective GitHub repositories: `R22 <Zigbee R22 add-on repository_>`_ and `R23 <Zigbee R23 add-on repository_>`_.
 
 .. include:: /includes/zigbee_deprecation.txt