docs: Update font installation instructions

ietf-tools / xml2rfc

Generate RFCs and IETF drafts from document source in XML according to the IETF xml2rfc v2 and v3 vocabularies

https://ietf-tools.github.io/xml2rfc/

BSD 3-Clause "New" or "Revised" License

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Closed kesara closed 2 months ago

kesara commented 11 months ago

Update font installation instructions to use xml2rfc-fonts repository.

Fixes #1030