Apply new format to snippets and template

snippets/mapString.md

@@ -5,9 +5,9 @@ tags: string,array,function,beginner
 
 Creates a new string with the results of calling a provided function on every character in the calling string.
 
-Use `String.prototype.split('')` and `Array.prototype.map()` to call the provided function, `fn`, for each character in `str`.
-Use `Array.prototype.join('')` to recombine the array of characters into a string.
-The callback function, `fn`, takes three arguments (the current character, the index of the current character and the string `mapString` was called upon).
+- Use `String.prototype.split('')` and `Array.prototype.map()` to call the provided function, `fn`, for each character in `str`.
+- Use `Array.prototype.join('')` to recombine the array of characters into a string.
+- The callback function, `fn`, takes three arguments (the current character, the index of the current character and the string `mapString` was called upon).
 
 ```js
 const mapString = (str, fn) =>