Update help message

src/make_userland.sh

@@ -11,11 +11,15 @@ Create Debian userland filesystem for MNT Reform
 This script create an userland system for the MNT Reform 2 laptop
 
 USAGE:
-make_userland.sh -t <target> -r <recipe> -m <mirror>
+make_userland.sh -o <output> -r <recipe> -m <mirror>
 
-<target>
+  -o <output> directory tha contain our userlan system. a subdirectory with 
+   the recipe name will be created. Default: \tmp
 
-<recipe>.
+  -r <recipe> : recipe to apply, the name must be a subdorectory of the recipe\
+   directory. Default: default
+
+  -m <mirror> : debian mirror where download packages. Default: ftp.debian.org
 EOF
 }