for single-use algorithm, document whether the issuer and holder algorithms may be different

[dwaite]

From @OR13, https://mailarchive.ietf.org/arch/msg/jose/GkL3I9hEoKjaIDCgno_rYqQsSP0/ :

An example with a mixed algorithm for issue and holder would be nice here,
or a comment about it being forbidden... for example issuer signing with
ES256 and holder presenting with EdDSA.

[selfissued]

Clearly the issuer and holder algorithms have to be able to be different. I'll review the specs with this in mind.

[dwaite]

I believe this work has been done, @selfissued are you ok with this being closed?

[selfissued]

Let's consider this together with #57. On the surface of it, it seems that we have to to address that one to address this one.

[dwaite]

I do not think this is the same as #57 / #59 . We just need to make this clear for algorithms in general