change br tags in the details tag to use pre tag

While <br> tags do work in the details tag,
the list is not in a monospace font.

Let's try using the <pre> tag instead.

docs/README.md

@@ -1,7 +1,5 @@
 # Bob User Guide
 
----
-
 ![Screenshot of a window of Bob.](./Ui.png)
 
 Meet **Bob**, the ultimate companion that not only helps you manage tasks, 
@@ -221,16 +219,16 @@ tag
 
 <summary>Using this list</summary>
 
-1. `[D][ ] #URGENT Finish CS2103T iP (by: {26-Sep-2024 2359})` <br>
-2. `[T][ ] #JustAnotherDay Eat dinner` <br>
-3. `[T][ ] #JustAnotherDay Wake up` <br>
-4. `[E][ ] SDG Hackathon (from: {26-Sep-2024 0000} to: {28-Sep-2024 0000})` <br>
-5. `[D][ ] #URGENT Finish CS1101S grading (by: {27-Sep-2024 0000})` <br>
-6. `[T][ ] #JustAnotherDay Eat lunch` <br>
-7. `[T][ ] #URGENT #JustAnotherDay Relax for a bit` <br>
-8. `[T][ ] #URGENT Prepare for midterms` <br>
-
-[Example Data File](./Bob.txt) <br>
+<pre>
+1. [D][ ] #URGENT Finish CS2103T iP (by: {26-Sep-2024 2359})
+2. [T][ ] #JustAnotherDay Eat dinner
+3. [T][ ] #JustAnotherDay Wake up
+4. [E][ ] SDG Hackathon (from: {26-Sep-2024 0000} to: {28-Sep-2024 0000})
+5. [D][ ] #URGENT Finish CS1101S grading (by: {27-Sep-2024 0000})
+6. [T][ ] #JustAnotherDay Eat lunch
+7. [T][ ] #URGENT #JustAnotherDay Relax for a bit
+8. [T][ ] #URGENT Prepare for midterms
+</pre>
 
 </details>
 
@@ -302,5 +300,3 @@ I'll be here if you need me. Catch you later!
 ```
 
 and exit immediately.
-
----