Improve readability of documentation

[theextremeprogrammer]

• [x] Mark classes, interfaces, and type aliases as internal if they are not expected to be a part of the API or documentation (this just clutters the existing documentation and makes it more difficult to understand)
• [x] Add appropriate headers to the documentation (unsure how to do this with Jazzy; might take some experimentation)

[theextremeprogrammer]

Closing with 74ec7dc2d56cc745456a5e6d7eb19f98742e46fa