[Docs]: duplicate/wrong nimf examples

[ocobles]

I was about to update the shared_nimf_to_csp and shared_nimf_from_fcr examples because they refer wrongly equinix_metal_connection.metal-connection.authorization_code instead of equinix_metal_connection.example.authorization_code but I also saw that they are using a wrong type for the metal_connection, if I'm not wrong it should be shared_port_vlan and in the shared_nimf_from_fcr the a_side must be a fcr device and z_side metal