[2023-09-26] Update Interrobang RFC... to remove the interrobang 😉

[benjie]

Changes:

1. In the SDL, we add a question mark, this has the behavior of the field being expressly nullable
2. Anything that does not have a question mark is not supposed to be nullable ie if there is no value, then there MUST be an error in the errors array.
3. Introspection part: A flag that would indicate that a client is aware of this behavior and gets introspection that’s aware of this nullability

• assignee(s): @benjie
• source: https://github.com/graphql/client-controlled-nullability-wg/blob/main/notes/2023/2023-09.md#26th-september-meeting

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Note: Action Item issues are reviewed and closed during Working Group
meetings.

[benjie]

Interrobang RFC replaced by graphql/graphql-spec#1048