Login Data should not be set to IDENTITY

[jbagnara]

Set Attributes section indicates that the "login data" field must be set in order to transfer subkeys:

gpg --command-fd=0 --pinentry-mode=loopback --edit-card <<EOF
admin
login
$IDENTITY
$ADMIN_PIN
quit
EOF

Setting this to $IDENTITY which likely contains PII could enable association between the yubikey and its owner.
I suggest the codeblock populate this field with a generic like "my yubikey" or "n/a", and a warning be added to the instructions.