ref(client): clarify usage of ps:restart

Author: Matthew Fisher

client/deis.py

@@ -1711,7 +1711,7 @@ def ps(self, args):
         Valid commands for processes:
 
         ps:list        list application processes
-        ps:restart     restart process types (e.g. web, worker)
+        ps:restart     restart an application or its process types
         ps:scale       scale processes (e.g. web=4 worker=2)
 
         Use `deis help [command]` to learn more.
@@ -1751,7 +1751,7 @@ def ps_list(self, args, app=None):
 
     def ps_restart(self, args):
         """
-        Restarts an application's processes by type.
+        Restart an application, a process type or a specific process.
 
         Usage: deis ps:restart [<type>] [options]