es_ES doi() inconsistent with definition

[VirenSDD]

When creating an instance of faker with locale="es_ES", the doi() method returns a random Spanish CIF or NIE or NIF, which has nothing to do with the DOI.

Example:

>>> from faker import Faker
>>> faker_instance = Faker(locale="es_ES")
>>> faker_instance.doi()
'Y7569754P'

Using version 35.0.0

[fcurella]

Thank you for the report!

Do you have time to prepare a Pull Request?