denylists: clarify doublehash way of supporting IPNS #482
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This PR adds a short mention how legacy doublehash notation can be used for representing IPNS and DNSLink block rules.
Rationale
What prompted me to adding this to specs is the fact that IPNS entries (double-hashed CIDv1 with libp2p-key codec) already are on https://badbits.dwebops.pub/ and we also have cases where a very bad ENS DNSLink needs to be blocked for legal reasons.
No IPIP because it does not change spec, only clarifies how to use existing notation in mutable context, which was missing from the spec.
Ref. internal issues with additional context (sadly too sensitive, can't be public):