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/dropRightWhile.md

@@ -2,7 +2,7 @@
 
 Removes elements from the end of an array until the passed function returns `true`. Returns the remaining elements in the array.
 
-Loop through the array, using `Array.slice()` to drop the last element of the array until the returned value from the function is `true`.
+Loop through the array, using `Array.prototype.slice()` to drop the last element of the array until the returned value from the function is `true`.
 Returns the remaining elements.
 
 ```js