Clarify that removeFromArray must always return an array (#602)

Author: olgacoz

foundations/08_removeFromArray/README.md

@@ -1,6 +1,6 @@
 # Exercise 08 - removeFromArray
 
-Implement a function that takes an array and some other arguments then removes the other arguments from that array:
+Implement a function that takes an array and some other arguments then removes the other arguments from that array, and returns the resulting array:
 
 ```javascript
 removeFromArray([1, 2, 3, 4], 3); // should remove 3 and return [1,2,4]
@@ -12,7 +12,7 @@ See if you can make use of some built-in array methods in this exercise.
 
 The first test on this one is fairly easy, but there are a few things to think about (or google) here for the later tests:
 
-- you can manipulate the original array you pass into the function call or create a new array that is returned as the result.
+- you can manipulate the original array you pass into the function call or create a new array that is returned as the result, but the function should return the resulting array regardless of the approach.
 - how to remove a single element from an array
 - how to deal with multiple optional arguments in a JavaScript function
 - For more information, check out MDN's page on [function arguments](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/arguments) - scroll down to the bit about `Array.from` or the spread operator. You can also check out MDN's page on [rest parameters](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/rest_parameters).