How to use bit-docs should be part of training

Think the title is rather self-descriptive, but I think it'd be valuable information to give a quick crash course on using bit-docs to document code in various scenarios; essentially go over all the tags and use them to document real examples, and generate the result.

Probably the best would be to build up from a codebase with no docs and keep showing new tags additively until all tags have been shown/used.

No file, test, or entry point is named; start by locating the training material and the bit-docs documentation or tag reference. Done means a crash course builds from undocumented code, demonstrates all tags through real examples, and generates the resulting documentation.

Written by the indexing model from the issue text.