Update Gradio description to clarify text-based input #427
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As discussed on internal Slack.
The input format for text-based metrics is not always clear. The Gradio app requires JSON-like input (so text enclosed in double quotes). If that is not given, an error is raised but not error details are given.
While ultimately a more informative error message would be the better solution, this PR provides a temporary solution by simply telling users the expected input format for text-based metrics.