Update git helper usage

buildroot/share/git/mffp

@@ -1,14 +1,14 @@
 #!/usr/bin/env bash
 #
-# mffp [1|2] [commit-id]
+# mffp [1|2|3] [commit-id]
 #
 # Push the given commit (or HEAD) upstream immediately.
 # By default: `git push upstream HEAD:bugfix-1.1.x`
 #
 
-[[ $# < 3 && $1 != "-h" && $1 != "--help" ]] || { echo "usage: `basename $0` [1|2] [commit-id]" 1>&2 ; exit 1; }
+[[ $# < 3 && $1 != "-h" && $1 != "--help" ]] || { echo "usage: `basename $0` [1|2|3] [commit-id]" 1>&2 ; exit 1; }
 
-if [[ $1 == '1' || $1 == '2' ]]; then
+if [[ $1 == '1' || $1 == '2' || $1 == '3' ]]; then
   MFINFO=$(mfinfo "$1") || exit 1
   REF=${2:-HEAD}
 else