check media type registration templates

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...for compliance with http://tools.ietf.org/html/rfc6838#section-5.6

Reported by julian.reschke@gmx.de, migrated from https://trac.ietf.org/trac/httpbis/ticket/526

[mnot]

julian.reschke@gmx.de commented:

From 2505:

update media type registration forms (see #526)

[mnot]

• julian.reschke@gmx.de changed resolution to incorporated
• julian.reschke@gmx.de changed status from new to closed