Update lessons/insertion.md

Abhijit25Mishra · Utkarsh1504 · web-flow · commit 9f90c2b4dbdf · 2021-10-01T22:36:55.000+05:30
Co-authored-by: Utkarsh Mishra &lt;76392681+Utkarsh1504@users.noreply.github.com&gt;
diff --git a/lessons/insertion.md b/lessons/insertion.md
@@ -67,7 +67,7 @@ The worst case for insertion sort will occur when the input list is in decreasin
 
 
 
-### Code Implementation 
+## Code Implementation
 
 ```java
 

Original file line number	Diff line number	Diff line change
`@@ -67,7 +67,7 @@ The worst case for insertion sort will occur when the input list is in decreasin`
`67`	`67`
`68`	`68`
`69`	`69`
`70`		`-### Code Implementation`
	`70`	`+## Code Implementation`
`71`	`71`
`72`	`72`	```java
`73`	`73`