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_archive/removeVowels.md

@@ -2,7 +2,7 @@
 
 Returns all the vowels in a `str` replaced by `repl`.
 
-Use `String.replace()` with a regexp to replace all vowels in `str`.
+Use `String.prototype.replace()` with a regexp to replace all vowels in `str`.
 Omot `repl` to use a default value of `''`.
 
 ```js