Fix example lunch target

We make this example valid for trunk stable.

Bug: 307738446
Test: lunch command
Change-Id: I25a142f1b87facebdcf2751f3f4cb68a0738945d
diff --git a/envsetup.sh b/envsetup.sh
index 3b76980..c20837b 100644
--- a/envsetup.sh
+++ b/envsetup.sh
@@ -776,7 +776,7 @@
     else
         print_lunch_menu
         echo "Which would you like? [aosp_arm-trunk_staging-eng]"
-        echo -n "Pick from common choices above (e.g. 13) or specify your own (e.g. aosp_barbet-eng): "
+        echo -n "Pick from common choices above (e.g. 13) or specify your own (e.g. aosp_barbet-trunk_staging-eng): "
         read answer
         used_lunch_menu=1
     fi