[likelihood_ratio_process] Update new section

[HumphreyYang]

This PR adds a new section in likelihood_ratio_process.

It also includes typo fixes to other probability lectures.

[github-actions]

🚀 Deployed on https://687b70d7dadc55547c9bef0d--nostalgic-wright-5fa355.netlify.app

[mmcky]

@HumphreyYang I see this is failing on the google collab test. Do I need to look into this?

[HumphreyYang]

@HumphreyYang I see this is failing on the google collab test. Do I need to look into this?

Hi @mmcky, I think there is some pulling issue in colab test. Would you mind having a look at the package it is trying to pull?

E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/g/ghostscript/libgs9-common_9.55.0%7edfsg1-0ubuntu5.11_all.deb  404  Not Found [IP: 91.189.91.82 80]
E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/g/ghostscript/libgs9_9.55.0%7edfsg1-0ubuntu5.11_amd64.deb  404  Not Found [IP: 91.189.91.82 80]
E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/g/ghostscript/ghostscript_9.55.0%7edfsg1-0ubuntu5.11_amd64.deb  404  Not Found [IP: 91.189.91.82 80]

Thanks so much!