"Validation of incoming decrypted events" section contains manifest nonsense

[richvdh]

Link to problem area:

https://spec.matrix.org/v1.17/client-server-api/#validation-of-incoming-decrypted-events

Issue

This says:

The keys.ed25519 property in the decrypted content must match the sender_key property in the cleartext m.room.encrypted event body.

But keys.ed25519 is an ed25519 key, and sender_key is a curve25519 key, so they are never going to match.

This seems to have been mangled during #2122, due to some brainfart on my part.