Tweak mf helper scripts

buildroot/share/git/mfqp

@@ -4,7 +4,7 @@
 #
 #  - git add .
 #  - git commit --amend
-#  - ghpc
+#  - git push -f
 #
 
 MFINFO=$(mfinfo "$@") || exit 1
@@ -17,6 +17,7 @@ IND=6
 while [ $IND -lt ${#INFO[@]} ]; do
   ARG=${INFO[$IND]}
   case "$ARG" in
+    -f|--force ) FORCE=1 ;;
      -h|--help ) USAGE=1 ;;
              * ) USAGE=1 ; echo "unknown option: $ARG" ;;
   esac
@@ -25,6 +26,6 @@ done
 
 [[ $USAGE == 1 ]] && { echo "usage: `basename $0` [1|2|3]" 1>&2 ; exit 1 ; }
 
-[[ $CURR == $TARG && $REPO != "MarlinDocumentation" ]] && { echo "Don't alter the PR Target branch."; exit 1 ; }
+[[ $FORCE != 1 && $CURR == $TARG && $REPO != "MarlinDocumentation" ]] && { echo "Don't alter the PR Target branch."; exit 1 ; }
 
 git add . && git commit --amend && git push -f