Fork the project, fix the typo and submit a pull request.
Open an issue explaining the problem and possibly how you think it should be fixed.
Fork the project and add your site to _data/built_with_sassdoc.yml then submit a pull request.
If you feel like a true hero, run make bws before, however note that you'll have to install webshot-cli. If you cannot or don't want to run this, ask a maintainer to do it in your pull request.