Add prototype to descriptions

snippets/sortCharactersInString.md

@@ -5,7 +5,7 @@ tags: string,beginner
 
 Alphabetically sorts the characters in a string.
 
-- Use the spread operator (`...`), `Array.prototype.sort()` and  `String.localeCompare()` to sort the characters in `str`, recombine using `String.prototype.join('')`.
+- Use the spread operator (`...`), `Array.prototype.sort()` and  `String.prototype.localeCompare()` to sort the characters in `str`, recombine using `String.prototype.join('')`.
 
 ```js
 const sortCharactersInString = str => [...str].sort((a, b) => a.localeCompare(b)).join('');