doc: Update Thread CLI sample with setting basic parameters.

This PR updates the documentation with setting
channel, panid, masterkey.

Signed-off-by: Piotr Szkotak <piotr.szkotak@nordicsemi.no>

Author: Piotr Szkotak

doc/nrf/includes/thread_configure_network.txt

@@ -0,0 +1,12 @@
+Configure the required Thread network parameters with the ``ot channel``, ``ot panid``, and ``ot masterkey`` commands.
+Make sure to use the same parameters for all nodes that you add to the network.
+The following example uses the default OpenThread parameters:
+
+.. code-block:: console
+
+   uart:~$ ot channel 11
+   Done
+   uart:~$ ot panid 0xabcd
+   Done
+   uart:~$ ot masterkey 00112233445566778899aabbccddeeff
+   Done

samples/openthread/cli/README.rst

@@ -133,6 +133,7 @@ After building the sample and programming it to your development kit, test it by
    .. note::
         |thread_hwfc_enabled|
 
+#. .. include:: /includes/thread_configure_network.txt
 #. .. include:: /includes/thread_enable_network.txt
 #. Invoke some of the OpenThread commands:
 
@@ -188,6 +189,7 @@ To test communication between kits, complete the following steps:
    .. note::
         |thread_hwfc_enabled|
 
+#. .. include:: /includes/thread_configure_network.txt
 #. .. include:: /includes/thread_enable_network.txt
 #. Test communication between the kits with the following command:
 
@@ -265,6 +267,7 @@ To test the Thread Specification v1.2 features, complete the following steps:
 #. Turn on the developments kits.
 #. Set up the serial connection with both development kits.
    For more details, see :ref:`putty`.
+#. .. include:: /includes/thread_configure_network.txt
 #. .. include:: /includes/thread_enable_network.txt
 #. Test the state of the Thread network with the ``ot state`` command to see which kit is the leader: