fix(curriculum): update description for step 19 of pyramid project (#54474)

curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-introductory-javascript-by-building-a-pyramid-generator/6610bbed59bc2a0194d85533.md

@@ -11,11 +11,17 @@ Notice how the value inside your `rows` array has been changed directly? This is
 
 Before moving on, this is a great opportunity to learn a common array use. Currently, your code accesses the last element in the array with `rows[2]`. But you may not know how many elements are in an array when you want the last one.
 
-You can make use of the `.length` property of an array - this returns the number of elements in the array. For example, your `rows` array has 3 elements, so `rows.length` would be `3`.
+You can make use of the `.length` property of an array - this returns the number of elements in the array. To get the last element of any array, you can use the following syntax:
 
-Since you know the last element is at index `2`, you can compare that with the length of the array and see it is one less. The last element of an array will always be accessible at the index `length - 1`. You can use that in your bracket notation.
+```js
+array[array.length - 1]
+```
 
-Update your `rows[2]` to access the `rows.length - 1` index instead of the `2` index. You should not see anything change in your console.
+`array.length` returns the number of elements in the array. By subtracting `1`, you get the index of the last element in the array. You can apply this same concept to your `rows` array.
+
+Update your `rows[2]` to dynamically access the last element in the `rows` array. Refer to the example above to help you.
+
+You should not see anything change in your console.
 
 # --hints--