Avoid confusing prototype methods for static methods

Correct: `Array.from()` (it’s a static method)
Incorrect: `Array.join()` (doesn’t exist; it’s a prototype method)

This patch uses the common `#` syntax to denote `.prototype.`.

snippets/isAnagram.md

@@ -2,7 +2,7 @@
 
 Checks if a string is an anagram of another string (case-insensitive, ignores spaces, punctuation and special characters).
 
-Use `String.toLowerCase()`, `String.replace()` with an appropriate regular expression to remove unnecessary characters, `String.split('')`, `Array.sort()` and `Array.join('')` on both strings to normalize them, then check if their normalized forms are equal.
+Use `String.toLowerCase()`, `String.prototype.replace()` with an appropriate regular expression to remove unnecessary characters, `String.prototype.split('')`, `Array.prototype.sort()` and `Array.prototype.join('')` on both strings to normalize them, then check if their normalized forms are equal.
 
 ```js
 const isAnagram = (str1, str2) => {