fix image local loading issue and add new line for headers

[agate]

Hi @Avik-Jain ,

Thanks for the great ML learning course! I noticed that Github is not allowing user to use blob url for rendering the image https://github.com/Avik-Jain/100-Days-Of-ML-Code/blob/master/Other%20Docs/data.PNG (unless you are rendering it from github website). I cloned your repo to local and open it via my markdown editor and I found the editor was not able to correctly render the images. And it turns out that you have to use raw instead of blob for fixing this problem. So I made this PR.

BRs, Hao.