Mention the correct brotli package

[OmLanke]

Warning: We have a feature freeze till release

That means we won't accept new features for now. Only bug fixes.

Summary

Mention the same brotli package and pypi link as it is in setup.py

Checklist

• If code changes were made then they have been tested.
  • I have updated the documentation to reflect the changes.
• If type: ignore comments were used, a comment is also left explaining why
• This PR fixes an issue.
• This PR adds something new (e.g. new method or parameters).
• This PR is a breaking change (e.g. methods or parameters removed/renamed)
• This PR is not a code change (e.g. documentation, README, typehinting, examples, ...)