RFC 373: Nesting Interfaces

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Add docblock syntax.

• Discussion: RFC: Allow interfaces to implement other interfaces graphql/graphql-spec#373

Example

interface Created {
    createdAt(format: String! = "RFC3339"): DateTime!
}

interface Updated {
    updatedAt(format: String! = "RFC3339"): DateTime
}

interface Timestamps implements Created, Updated {
}

######

type User implements Timestamps {
    # createdAt field required
    # updatedAt field required
}