Update the output of BASH KhanAcademy script.

[Kineolyan]

Description

As part of #688 I found that the output for the KhanAcademy downloader was the same as the one for the bookmark-keeper. Being it since the addition of the script, I updated them.

This PR only adds two screenshots for a README. No dependency update is required.

Type of change

• [x] Documentation Update

Checklist:

• [x] My code follows the style guidelines(Clean Code) of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have created a helpful and easy to understand README.md
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] I have added tests/screenshots(if any) that prove my fix is effective or that my feature works

[Kineolyan]

So far, I also spotted a very small typo in another README. Do you want me to merge it into this PR? I saw that #1118 previously made a huge pass correcting many documentation scripts. But at the same time, it was made by the author of the repo :smile: So it may be ok to do the same here.