The current tree is a mixture of different numbers of spaces. Unify
them to 4-space indents, as this seems to be the configuration
supported on most platforms out there.
Also rewrote the first sentence of retail-roms.md#assembly to be more correct. Assembly is a programming language, machine code is the native code, assembly is just very closely linked to machine code.
Also sorry translators, I shoulda done this before the big update 😅
