Update e-commerce data types assignment

Revised the assignment to focus on JavaScript data types in an e-commerce context, detailing their purposes, advantages, and providing structured examples.

https://github.com/microsoft/Web-Dev-For-Beginners/blob/main/2-js-basics/1-data-types/assignment.md
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2-js-basics/1-data-types/assignment.md

@@ -38,11 +38,11 @@ For each data type, structure your response like this:
 **Purpose in Shopping Cart:** [Explain what this data type does]
 
 **Why This Type:** [Explain why this is the best choice]
+```
 
 **Code Example:**
 ```javascript
 // Your realistic code example here
-```
 
 **Real-world Usage:** [Describe how this would work in practice]
 
@@ -84,4 +84,4 @@ By completing this assignment, you will:
 - ✅ **Analyze** when to choose specific data types for different purposes
 - ✅ **Create** working code examples that demonstrate data type usage
 - ✅ **Explain** technical concepts in beginner-friendly language
-- ✅ **Connect** fundamental programming concepts to practical applications
+- ✅ **Connect** fundamental programming concepts to practical applications