Update sample data
Problem: sample data in appendix A doesn't contain key_hash and signature,
also key sample is wrong.
Solution: add correct examples of key_hash, signature and key. They
were checked using tezos-client.
Problem: sample data in appendix A doesn't contain key_hash and signature,
also key sample is wrong.
Solution: add correct examples of key_hash, signature and key. They
were checked using tezos-client.