Fix typo. Show usage if invalid argument specified

Co-authored-by: sigonasr2 <sigonasr2@gmail.com>

Java/scripts/md5

@@ -4,6 +4,6 @@ clean.sh:668a2f9b568c55f6a044a509315032f6  -
 commit.sh:5e4448db9ad48e72ec3a1ff4f5763b41  -
 jar2.sh:7977fc138ee5db798d08c34734f0be93  -
 jar.sh:821d5a109324d405f05c35c4bb129375  -
-release.sh:33ea22e29252fae1c750d534dbf4b0aa  -
+release.sh:3e6149944238387b63cccc3ee93293fc  -
 update.sh:3be721658983183efa395984acd96b03  -
 zip.sh:273f5a83b80a8e54022d60514dfeec0a  -

Java/scripts/release.sh

@@ -1,4 +1,4 @@
-#Use ./sig package <windows|mac|linux> to create a custom installer based on OS.
+#Use ./sig release <windows|mac|linux> to create a custom installer based on OS.
 #Java
 source ${LANGUAGE}/scripts/version_info
 if [ "$1" = "windows" ];then
@@ -15,4 +15,7 @@ elif [ "$1" = "linux" ];then
     jpackage --app-image RabiCloneOut/RabiClone --name RabiClone
     cd RabiClone
     echo "Done!"
+else
+    echo "Usage: "
+    echo "  ./sig package <windows|mac|linux>"
 fi