cmd/cue/cmd: fix trim help

The example didn't work.

Change-Id: I65ed6568442ec9dfc9a5fcb3ad9c5fd61176ebae
Reviewed-on: https://cue-review.googlesource.com/c/cue/+/3344
Reviewed-by: Marcel van Lohuizen <mpvl@golang.org>
diff --git a/cmd/cue/cmd/trim.go b/cmd/cue/cmd/trim.go
index 2525134..fede5e5 100644
--- a/cmd/cue/cmd/trim.go
+++ b/cmd/cue/cmd/trim.go
@@ -58,14 +58,14 @@
 	$ cat <<EOF > foo.cue
 	light <Name>: {
 		room:          string
-		brightnessOff: 0.0 | >=0 & <=100.0
-		brightnessOn:  100.0 | >=0 & <=100.0
+		brightnessOff: *0.0 | >=0 & <=100.0
+		brightnessOn:  *100.0 | >=0 & <=100.0
 	}
 
 	light ceiling50: {
-		room:         "MasterBedroom"
-		brightnessOn:  100 // this line
-		brightnessOff: 0   // and this line will be removed
+		room:          "MasterBedroom"
+		brightnessOff: 0.0    // this line
+		brightnessOn:  100.0  // and this line will be removed
 	}
 	EOF
 
@@ -73,8 +73,8 @@
 	$ cat foo.cue
 	light <Name>: {
 		room:          string
-		brightnessOff: 0.0 | >=0 & <=100.0
-		brightnessOn:  100.0 | >=0 & <=100.0
+		brightnessOff: *0.0 | >=0 & <=100.0
+		brightnessOn:  *100.0 | >=0 & <=100.0
 	}
 
 	light ceiling50: {