fix(curriculum): Updated the description of calorie counter- step 50 (#53462)

Co-authored-by: Joy Shaheb <khondokoralam@gmail.com>
Co-authored-by: Krzysztof G. <60067306+gikf@users.noreply.github.com>

curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-form-validation-by-building-a-calorie-counter/63c21dea919c8e4adb0df8e8.md

@@ -9,7 +9,25 @@ dashedName: step-50
 
 In the Role Playing Game project, you learned how to set a button's behavior by editing its `onclick` property. You can also edit an element's behavior by adding an event listener.
 
-Call the `.addEventListener()` method of the `addEntryButton`. It takes two arguments. The first is the event to listen to – you should pass the string `click`. The second is the callback function, or the function that runs when the event is triggered. Pass the `addEntry` function as the second argument. Note that you should not *call* `addEntry`, but pass the variable (or <dfn>function reference</dfn>) directly.
+The following example uses the `addEventListener` method to add a click event to a button. When the button is clicked, the `printName` function is called.
+
+```html
+<button class="btn">Print name</button>
+```
+
+```js
+const button = document.querySelector('.btn');
+function printName() {
+  console.log("Jessica");
+}
+button.addEventListener('click', printName);
+```
+
+The `addEventListener` method takes two arguments. The first is the event to listen to. (Ex. `'click'`) The second is the callback function, or the function that runs when the event is triggered.
+
+Call the `.addEventListener()` method on the `addEntryButton`. Pass in the string `click` for the first argument and the `addEntry` function for the second argument.
+
+Note that you should not *call* `addEntry`, but pass the variable (or <dfn>function reference</dfn>) directly.
 
 # --hints--