fix(curriculum): replace unrelated HTML defer/async question with a new one (#60855)

Co-authored-by: Krzysztof G. <60067306+gikf@users.noreply.github.com>
Co-authored-by: Huyen Nguyen <25715018+huyenltnguyen@users.noreply.github.com>

curriculum/challenges/english/25-front-end-development/lecture-understanding-asynchronous-programming/67340798c2c1776709d8a5fe.md

@@ -46,35 +46,35 @@ In short, use `async` for scripts where the order of execution doesn't matter, a
 
 ## --text--
 
-What happens when a script tag has both `async` and `defer` attributes?
+What is the advantage of using the `defer` attribute in a `<script>` tag?
 
 ## --answers--
 
-The script is downloaded asynchronously and executed immediately after download.
+It helps differentiate the script from `async` scripts.
 
 ### --feedback--
 
-Consider which attribute takes precedence when both are present.
+Remember the purpose and differences of the `defer` and `async` attributes.
 
 ---
 
-The script is downloaded asynchronously and executed after HTML parsing is complete.
+It reduces memory usage during page load.
 
 ### --feedback--
 
-Consider which attribute takes precedence when both are present.
+The `defer` attribute has nothing to do with memory management.
 
 ---
 
-The `defer` attribute is ignored, and the script behaves as if only `async` was present.
+It can improve the overall page loading performance.
 
 ---
 
-The browser throws an error.
+It lets developers set a custom delay time before scripts run.
 
 ### --feedback--
 
-Consider which attribute takes precedence when both are present.
+The `defer` attribute doesn't execute scripts on a custom timer.
 
 ## --video-solution--