Hello, welcome to my humble documentation page :)
You can find some descriptions for feross's webtorrent project,but you should be careful as to use this repo as a definite source of documentation for his project.
I use ferosses own documentation that you can find in his code and readme(it's good). Rest is just written by reading the code.
It's more for me to understand his project indepth.
I have tried to use the style on MDN for familiarity
I'll try to add some documentation every day, perhaps I'll write a small guide, but this is unlikely since my time resources will be limited in the near future.
Soft-Documentation for feross/webtorrent
Current version 0.53.3