cli: Explicitly document use of name in show

Currently the help text for the "show" command doesn't explicitly
include the use of "name" in the syntax summary. This patch add it.

Change-Id: I7dd38f98d73ddd184321ca0a07cf9e31e3afe97e
Bug-Url: https://bugzilla.redhat.com/1091725
Signed-off-by: Juan Hernandez <juan.hernandez@redhat.com>