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/escapeRegExp.md

@@ -2,7 +2,7 @@
 
 Escapes a string to use in a regular expression.
 
-Use `String.replace()` to escape special characters.
+Use `String.prototype.replace()` to escape special characters.
 
 ```js
 const escapeRegExp = str => str.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');