Update TP parallel GEMM image
I added column parallel and row parallel image

![parallelism-tp-parallel_gemm](https://user-images.githubusercontent.com/38183241/138383838-e9037796-4b73-42dd-918d-e0c42813e2dd.png)

## reviewers
@stas00 
this image is wrong.
don't merge now.
I'll update image and explanation.<|||||><img width="812" alt="parallelism-tp-parallel_gemm" src="https://user-images.githubusercontent.com/38183241/138397848-0d73658d-3fda-4a95-b7f2-1f5e232d4e47.png">
<|||||>I updated image ! Can you merge this? @stas00<|||||>Thank you for making the improvements, @hyunwoongko!