cmd_mtree: added group short help

kamcli/commands/cmd_mtree.py

@@ -5,7 +5,11 @@ from kamcli.cli import pass_context
 from kamcli.iorpc import command_ctl
 
 
[email protected]("mtree", help="Manage mtree module (memory trees)")
[email protected](
+    "mtree",
+    help="Manage mtree module (memory trees)",
+    short_help="Manage mtree module",
+)
 @pass_context
 def cli(ctx):
     pass