[doc] fix: using-events graphql error

[klren0312]

Description

The GraphQL in Query events with GraphQL has error

Test plan

1. crates/sui-graphql-rpc/examples/event_connection/event_connection.graphql and crates/sui-graphql-rpc/examples/event_connection/filter_by_sender.graphql

throw the error

{
  "data": null,
  "errors": [
    {
      "message": "Unknown field \"type\" on type \"Event\".",
      "locations": [
        {
          "line": 18,
          "column": 7
        }
      ]
    },
    {
      "message": "Unknown field \"json\" on type \"Event\".",
      "locations": [
        {
          "line": 25,
          "column": 7
        }
      ]
    }
  ]
}

need to be modified to

contents {
  type {
    repr
  }
  json
}

2. crates/sui-graphql-rpc/examples/event_connection/filter_by_emitting_package_module_and_event_type.graphql

throw the error

{
  "data": null,
  "errors": [
    {
      "message": "Filtering by both emitting module and event type is not supported",
      "locations": [
        {
          "line": 2,
          "column": 3
        }
      ],
      "path": [
        "events"
      ],
      "extensions": {
        "code": "BAD_USER_INPUT"
      }
    }
  ]
}

Read the EventFilter.emittingModule doc, it says We currently do not support filtering by emitting module and event type at the same time so if both are provided in one filter, the query will error..

So I think the doc need to delete the example [Filter events by emitting package and type]

---

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[amnn]

Amazing, thank you for this contribution @klren0312 !