I think that "self-documenting code" only covers the what, though. Code, regardless of style or language is fundamentally just a bunch of instructions; the why

I think that "self-documenting code" only covers the what, though. Code, regardless of style or language is fundamentally just a bunch of instructions; the why (and sometimes how, i.e. assumptions/preconditions/platform-level details, and so on) can't really be encoded there.