JS2 Part 3 syntax error corrected

content/lessons/js2/sublesson/map_reduce_and_filter_functions.mdx

@@ -1406,7 +1406,8 @@ When the function is running, `this` refers to the object that comes before `.`.
 ```jsx
 Array.prototype.last = function () {
   return this[this.length - 1]
-}[(1, 2, 3)].last() // When the last function is run, 'this' refers to [1,2,3]
+};
+[1, 2, 3].last() // When the last function is run, 'this' refers to [1,2,3]
 const jackfruit = [1, 2, 3].last() // What is jackfruit?
 ```
 
@@ -1415,7 +1416,8 @@ const jackfruit = [1, 2, 3].last() // What is jackfruit?
 ```jsx
 Array.prototype.last = function () {
   return this[this.length - 1]
-}[(1, 2, 3)].last() // When the last function is run, this refers to [1,2,3]
+};
+[1, 2, 3].last() // When the last function is run, this refers to [1,2,3]
 jackfruit = [1, 2, 3].last() // 3
 ```