[2021-03-04] Review and merge 'Replace query error with request error'

[benjie]

graphql/graphql-spec#803

• Lee: ACTION - I will do a careful review and merge it.

• assignee(s): @leebyron
• source: https://github.com/graphql/graphql-wg/blob/main/notes/2021-03-04.md#advancing-replace-query-error-with-request-error-5m-benjie

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