Update generate-an-array-of-all-object-keys-with-object.keys.english.md (#36578)

Method should act on any passed parameter rather than the specific object named in this problem.

curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/generate-an-array-of-all-object-keys-with-object.keys.english.md

@@ -93,7 +93,7 @@ let users = {
 };
 
 function getArrayOfUsers(obj) {
-  return Object.keys(users);
+  return Object.keys(obj);
 }
 
 console.log(getArrayOfUsers(users));