[FAB-9628] Remove CLI sleep reference from docs

When trying the document found it mentioned 1000 seconds but
not able to find in the configuration files, and found
commit 981efba23294aee10b1fcc0d38da4bbbc776f92c
already removed the 1000 timeout, so update doc accordingly.

Change-Id: Id8aaf74882a5533041f5773de002ea4bd8f8b24e
Signed-off-by: jichenjc <jichenjc@cn.ibm.com>
Signed-off-by: Kostas Christidis <kostas@christidis.io>

Author: jichenjc

docs/source/build_network.rst

@@ -497,12 +497,6 @@ First let's start your network:
 If you want to see the realtime logs for your network, then do not supply the ``-d`` flag.
 If you let the logs stream, then you will need to open a second terminal to execute the CLI calls.
 
-The CLI container will stick around idle for 1000 seconds. If it's gone when you need it you can restart it with a simple command:
-
-.. code:: bash
-
-    docker start cli
-
 .. _peerenvvars:
 
 Environment variables