fixed typo in help

bootstrap-bullseye.sh

@@ -265,6 +265,6 @@ case $1 in
     unmount
     ;;
   *)
-    echo "Valid functions are: grmlnetwork, install, postinstall and umount" >&2
+    echo "Valid functions are: grmlnetwork, install, postinstall and unmount" >&2
     ;;
-esac
+esac