An issue on the blog post

Hey everyone,
I am new to the freeCodeCamp and I was reading about typescript blog that has been posted on freeCodeCamp and I realized there is a mistake in the content section of the blog

How to Implement Class Contracts

How to Extend Interfaces

these sub-headers introduces relevant context but the explanation is same with the

How to Type-Check Function Parameters

Can you check it out and maybe correct it ?
Here is the link of the blog: