Update README.md

Correcting a typo

README.md

@@ -223,13 +223,13 @@ I need to find the top 5 most expensive products in the Electronics category. Th
 3. Limiting to 5 results
 </think>
 <answer>
-```sql
+\```sql
 SELECT product_id, name, price, category
 FROM products
 WHERE category = 'Electronics'
 ORDER BY price DESC
 LIMIT 5;
-```
+\```
 </answer>
 ```