Adjust sample code so it makes more sense

In order for the following line, pop(), to return "employeeB", employeeB needs to be on the "top" of the stack, meaning the splice should remove employeeC at index 2. :)

Author: travisleithead

index.bs

@@ -6931,7 +6931,7 @@ string "<code>ObservableArray</code>".
         building.employees.push(new Employee("B"));
         building.employees.push(new Employee("C"));
 
-        building.employees.splice(1, 1);
+        building.employees.splice(2, 1);
         const employeeB = building.employees.pop();
 
         building.employees = [new Employee("D"), employeeB, new Employee("C")];