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/transform.md

@@ -2,7 +2,7 @@
 
 Applies a function against an accumulator and each key in the object (from left to right).
 
-Use `Object.keys(obj)` to iterate over each key in the object, `Array.reduce()` to call the apply the specified function against the given accumulator.
+Use `Object.keys(obj)` to iterate over each key in the object, `Array.prototype.reduce()` to call the apply the specified function against the given accumulator.
 
 ```js
 const transform = (obj, fn, acc) => Object.keys(obj).reduce((a, k) => fn(a, obj[k], k, obj), acc);