Fix tutorials after introduction of MetricFetchResult #1475
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Summary:
A few tutorials were not compatible with the new way we fetch data. In this diff we change custom metrics to return Ok(data) instead of data, and change
trial.fetch_data()
=>Metric._unwrap_trial_data_multi(results=trial.fetch_data())
.In the future we may want to add some copy in the tutorials discussing Result, but we should land this for now to get things working again ASAP
Differential Revision: D40994060