<count> processes from the given process definition.
<count> can be an absolute value like
2 or a relative value like
[-3] If server is provided, will start
<count> processes on that server. If server is not provided, will start
<count> processes on every server. NOTE: the square brackets are required for relative count values.
$ cx processes scale --stack <application name> [--server <server name>] [--name <process name>] [<count>]