cmd/cue: stop help text implying support for globs

This updates the help text for `cue vet` in order to stop implying that
the command has first class support for globs.

Globs aren't available in environments without a shell, such as the
cmd/cue container image, and aren't required to demonstrate cue-vet's
"check multiple non-CUE files" mode accurately.

Signed-off-by: Jonathan Matthews <[email protected]>
Change-Id: Ie088e3b5dac70fb89f3acd523e2160316fe86e96
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/1207936
TryBot-Result: CUEcueckoo <[email protected]>
Reviewed-by: Daniel Martí <[email protected]>

Author: jpluscplusm

cmd/cue/cmd/vet.go

@@ -57,7 +57,7 @@ Examples:
   cue vet foo.cue foo.yaml
 
   # Check files against a particular expression
-  cue vet foo.cue translations/*.yaml -d '#Translation'
+  cue vet foo.cue lang/en.yaml lang/de.yaml -d '#Translation'
 
 More than one expression may be given using multiple -d flags. Each non-CUE
 file must match all expression values.