Fix #12673: Make the author description more readable

[iwoithe]

Resolves: #12673

Makes the author description in Learn -> Classes more readable by shortening the text width. Let me know if you want the text width further adjusted.

Screenshots

Before

After

• [ ] I signed CLA
• [x] I made sure the code in the PR follows the coding rules
• [x] I made sure the code compiles on my machine
• [x] I made sure there are no unnecessary changes in the code
• [x] I made sure the title of the PR reflects the core meaning of the issue you are solving
• [x] I made sure the commit message(s) contain a description and answer the question "Why do those changes fix that particular issue?" or "Why are those changes really necessary as improvements?"
• [x] I made sure the commit message title starts with "fix #424242:" if there is a related issue
• [ ] I created the test (mtest, vtest, script test) to verify the changes I made

Also on less wide screen, it doesn't scroll. On mine, I can't see the button :-(

@MarcSabatella I will address this in a separate PR.