[2023-02] Ping implementors to ensure RFC 987 won't cause issues

[benjie]

• RFC; previously discussed
  in September
• Aim: merge this (mostly) editorial change
• Lee: this is a change in behavior but it does seem to align with the intent.
• Lee: lets check this with the implementations to make sure there's no issues
  there. It may be that when printing the schema out there is an issue where the
  old behavior was followed.
• Benjie: I think the code block in the top comment can be used as a test case -
  read the code in, generate the schema from it, and print it out - it should be
  the same (i.e. no mutation operation)
• ACTION - Benjie - tag implementors and check that this won't cause issues.

Relates to graphql/graphql-spec#987

Retroactive; implementors were pinged in graphql/graphql-spec#987 (comment)

• assignee(s): @benjie
• source: https://github.com/graphql/graphql-wg/blob/main/notes/2023/2023-02.md#fix-ambiguity-around-when-schema-definition-may-be-omitted-10m-benjie

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