Doctype rfc in relaton-data-misc

[kesara]

Description

This might be related to https://github.com/ietf-tools/relaton-data-misc/issues/16 See:

• https://bib.ietf.org/get-one/by-docid/?docid=NIST+SP.800-185&doctype=NIST&format=bibxml
• https://bib.ietf.org/get-bibliographic-item/?query=NIST.500-20.1977

doctype: rfc is causing issues

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