Improve lua syntax file

syntax_files/lua.yaml

@@ -50,11 +50,11 @@ rules:
         rules: []
 
     - comment: 
-		start: "\-\-"
+        start: "\\-\\-"
         end: "$"
         rules: []
 
     - comment: 
-		start: "\-\-\[\["
-		end: "\]\]"
+        start: "\\-\\-\\[\\["
+        end: "\\]\\]"
         rules: []