Exercise2 - networkmagic -> testnetmagic

[Martin Lang]

the --network-magic parameters used in the tutorial should be renamed to --testnet-magic.
not working with the latest cardano-cli

[Martin Lang]

also, paragraph 7:

cardano-node shelley transaction calculate-min-fee --protocol-params-file protocol-parameters.json...

should be cardano-cli, not cardano-node

[Artur Wieczorek]

Thanks for reporting this.
This is fixed in #49