Fixed headings

Author: sourabhbagrecha

Diff for: docs/50-aggregation/3-sort-limit.mdx

@@ -72,7 +72,7 @@ SELECT * FROM books ORDER BY timestamp DESC LIMIT 5;
 
 ## 👐 Challenge
 
-## 👐 1. After the year 2010, which book has the most number of authors?
+### 👐 1. After the year 2010, which book has the most number of authors?
 
 <details>
   <summary>Answer</summary>

Diff for: docs/50-aggregation/7-CREATE-VIEW.mdx

@@ -61,7 +61,7 @@ db.books.aggregate([
 ]);
 ```
 
-### **Equivalent SQL query**
+**Equivalent SQL query**
 
 ```sql
 INSERT INTO genre_summary (genre, totalBooks)