Dataset example in reference incorrect

[Jeadie]

I don't think the previous reference documentation was correct. Running it as a part of a spicepod results in no datasets, and spiced attempting to load a local file.

>>> spiced
2024-04-18T03:54:03.476499Z  INFO runtime::flight: Spice Runtime Flight listening on 127.0.0.1:50051
thread 'tokio-runtime-worker' panicked at crates/runtime/src/dataconnector/localhost.rs:53:9:
not implemented: read_provider not yet implemented for localhost provider
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
2024-04-18T03:54:03.476651Z  INFO runtime::opentelemetry: Spice Runtime OpenTelemetry listening on 127.0.0.1:50052
2024-04-18T03:54:03.479871Z  INFO runtime::http: Spice Runtime HTTP listening on 127.0.0.1:3000
^C2024-04-18T03:54:52.051280Z  INFO runtime: Goodbye!

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