correct gcfg command example to cue command

Closes #37
https://github.com/cuelang/cue/pull/37

GitOrigin-RevId: f5afe759169f40faa128b07b50bfd043e9dd935f
Change-Id: Id6c965d49087cfff25565fa0ccdba854096ec1a7
Reviewed-on: https://cue-review.googlesource.com/c/cue/+/1860
Reviewed-by: Marcel van Lohuizen <mpvl@google.com>
diff --git a/cmd/cue/cmd/root.go b/cmd/cue/cmd/root.go
index ad6528e..0f76eeb 100644
--- a/cmd/cue/cmd/root.go
+++ b/cmd/cue/cmd/root.go
@@ -57,7 +57,7 @@
 
 cue can also combine the results of http or grpc request with the input
 configuration for further processing. For more information on defining commands
-run 'gcfg help commands' or go to cuelang.org/pkg/cmd.
+run 'cue help cmd' or go to cuelang.org/pkg/cmd.
 
 For more information on writing CUE configuration files see cuelang.org.`,
 	// Uncomment the following line if your bare application