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/capitalizeEveryWord.md

@@ -2,7 +2,7 @@
 
 Capitalizes the first letter of every word in a string.
 
-Use `String.replace()` to match the first character of each word and `String.toUpperCase()` to capitalize it.
+Use `String.prototype.replace()` to match the first character of each word and `String.prototype.toUpperCase()` to capitalize it.
 
 ```js
 const capitalizeEveryWord = str => str.replace(/\b[a-z]/g, char => char.toUpperCase());