Update snippet descriptions

snippets/sample.md

@@ -5,7 +5,8 @@ tags: array,random,beginner
 
 Returns a random element from an array.
 
-- Use `Math.random()` to generate a random number, multiply it by `length` and round it off to the nearest whole number using `Math.floor()`.
+- Use `Math.random()` to generate a random number.
+- Multiply it by `Array.prototype.length` and round it off to the nearest whole number using `Math.floor()`.
 - This method also works with strings.
 
 ```js