Generating revocations.efi documentation

[514amir]

There is no explicit documentation I can find on how to generate revocations.efi which gets looked for by shim 15.8 at least during a PXE boot. It throws a warning and I'd prefer to not have the warning. I've seen the documentation on updating the revocation list but I am not sure how it applies to revocations.efi

[jsetje]

I have some docs on this coming, although the PXE warning is a pretty special case. If we go looking for the file during PXE and it's not there, which is likely the common case, there will be a warning, since there is not readdir support there.