fix: styling - fix on documentation for lesson 8-h

[Aymeric-Henry]

Before submitting the PR, please make sure you do the following

• This message body should clearly illustrate what problems it solves.

In lessons 8 - H it's appear to be missing style, the disturbing list harm the comprehension of the lesson.

Current Display:

Solution proposed:

Tests and linting

• Run the tests with pnpm test and lint the project with pnpm lint

[PuruVJ]

Thank you!