cmd/cue/cmd: small help command fixes

Closes #205
https://github.com/cuelang/cue/pull/205

GitOrigin-RevId: 1fc0f5a753fb012061d92e4ef13b74c3a2129027
Change-Id: Ieb767fb5c5a42d2eeaa305dad1501b25f1e6724e
Reviewed-on: https://cue-review.googlesource.com/c/cue/+/4280
Reviewed-by: Marcel van Lohuizen <mpvl@golang.org>
diff --git a/cmd/cue/cmd/cmd.go b/cmd/cue/cmd/cmd.go
index 29fef5f..333239e 100644
--- a/cmd/cue/cmd/cmd.go
+++ b/cmd/cue/cmd/cmd.go
@@ -173,10 +173,10 @@
 	}
 	EOF
 
-	$ cue cmd echo
+	$ cue cmd hello
 	Hello World! Welcome to Amsterdam.
 
-	$ cue cmd echo -who you
+	$ cue cmd hello -who you  # Setting arguments is not supported yet by cue
 	Hello you! Welcome to Amsterdam.