Added start docker command

Also removed the redundant information.

node_client.asciidoc

@@ -161,7 +161,7 @@ docker exec cname command
 
 ...where +cname+ is the name we gave the container in the +run+ command, and +command+ is an executable or script that we want to run inside the container.
 
-*Stopping a container*
+*Stopping and starting a container*
 
 In most cases, if we are running a container in an _interactive_ as well as _terminal_ mode, i.e. with the +i+ and +t+ flags (combined as +-it+) set, the container can be stopped by simply pressing +CTRL-C+ or by exiting the shell with +exit+ or +CTRL-D+. If a container does not terminate, you can stop it from another terminal like this:
 
@@ -169,7 +169,11 @@ In most cases, if we are running a container in an _interactive_ as well as _ter
 docker stop cname
 ----
 
-...where +cname+ is the name we gave the container when we ran it.
+To resume an already existing container use the `start` command, like so:
+
+----
+docker start cname
+----
 
 *Deleting a container by name*