[FAB-7992]Fix doc to restart cli container in RYFN.

In Reconfiguring Your First Network, the document has incorrect
instruction about relaunching cli container.

According to the instruction described in
fabric/docs/source/channel_update.rst, ``docker start cli`` is
executed to relaunch cli container, which is configured in Bring
Your First Network.
However, cli container fails to relaunch because a script
is called to build the same existing fabric network.
To use cli container for manual work in Reconfiguring Your Fabric
network, this script should not be executed.

This CR adds the instruction to comment out script in
docker-compose-cli.yaml and relaunch cli container.

Change-Id: I1b732e1c3b73292dfd0f1931fd81064ea6cab14b
Signed-off-by: Yuki Kondo <yuki.kondo@hal.hitachi.com>

Author: yuki-kon

docs/source/channel_update.rst

@@ -134,11 +134,23 @@ your containers:
 
   docker ps -a
 
-If necessary, relaunch the CLI:
+If necessary, relaunch the CLI. We want to run several commands manually.
+Before relaunching the network, open the ``docker-compose-cli.yaml`` file
+and comment out the script.sh in the CLI container. If left uncommented,
+that script will try to launch the same network again and fail due to conflict.
+Your docker-compose should be modified to look like this:
 
 .. code:: bash
 
-  docker start cli
+  working_dir: /opt/gopath/src/github.com/hyperledger/fabric/peer
+  # command: /bin/bash -c './scripts/script.sh ${CHANNEL_NAME}; sleep $TIMEOUT'
+  volumes
+
+After modifying ``docker-compose-cli.yaml``, relaunch the CLI container:
+
+.. code:: bash
+
+  docker-compose -f docker-compose-cli.yaml up -d cli
 
 Now install the ``jq`` tool into the container.  This tool allows us script interactions
 with JSON objects returned by the ``configtxlator`` tool: