cmd/export: fix help

Closes #819

Change-Id: I273b0117bddf7e32c4f6f5bf5d706a889144b7ff

Closes #825
https://github.com/cuelang/cue/pull/825

GitOrigin-RevId: c574bb42e2b012c79cef79fd8aa7727d5dce308d
Change-Id: I7e9d121da87bdd4c1fdc5c35973bd618814d77db
Reviewed-on: https://cue-review.googlesource.com/c/cue/+/8981
Reviewed-by: Marcel van Lohuizen <mpvl@golang.org>
diff --git a/cmd/cue/cmd/export.go b/cmd/cue/cmd/export.go
index 9a5e302..f9b3037 100644
--- a/cmd/cue/cmd/export.go
+++ b/cmd/cue/cmd/export.go
@@ -63,8 +63,10 @@
 yields the following JSON:
 
 	{
+		"arg1": 1,
 		"a": 1,
-		"b", "my string"
+		"arg2": "my string",
+		"b": "my string"
 	}
 
 In absence of arguments, the current directory is loaded as a package instance.