[ogg-dev] final changes to mimetypes rfc

[ogg.k.ogg.k at googlemail.com]

> I have one question in particular: Ogg.k.ogg.k: is the kate codec
> parameter now down to 8 bytes? If so, it's ok, since I've already made
> that change.

Yes, it is now \200kate\0\0\0, and the remaining 0 is now deemed a
reserved 0 byte in all headers, rather than part of the signature.
I think I've changed all the docs/wiki to reflect this - anything still
showing the old 9 byte signature I'll fix if I see.

Thanks