[quicwg/base-drafts] Reserved frame types and the other reserved frame types (#2997)

[Mike Bishop <[e-mail]>]

Fixes #2692, fixes #2693.

So it turns out that there are two different things called "reserved frame types" in HTTP/3.  There are the types reserved for greasing, and there are the types reserved to minimize confusion at code point overlap with HTTP/2.  This PR makes three changes, separable if there's controversy:
- Adds "Reserved" to the frame type table, pointing to the Reserved Types section, and indicates they can be sent on all stream types.
- Clarifies in the Reserved section that GREASE frames can be sent on any open stream
- Calls out the reserved-for-H2 types as MUST NOT send, MAY error.
- Clarifies in the Extensibility section that, while you ignore frame types you don't know, you don't ignore that it wasn't the frame you were expecting if a particular type was required to be in that position.
You can view, comment on, or merge this pull request online at:

  https://github.com/quicwg/base-drafts/pull/2997

-- Commit Summary --

  * Additional clarity on reserved frame types and the other reserved frame types

-- File Changes --

    M draft-ietf-quic-http.md (20)

-- Patch Links --

https://github.com/quicwg/base-drafts/pull/2997.patch
https://github.com/quicwg/base-drafts/pull/2997.diff

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