Document how to use multiple providerScopes

[lhotwll217]

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Describe the problem

No example on using more than one provider scope so I am just guessing that it is separating them by space or comma and not sure if it is right. I would assume it would be an array of strings. Is there actual API documentation instead of the Supabase examples that are simple.

Describe the improvement

Explain how to use multiple provider scopes. Or change array of strings if multiple are supported, that may be more intuitive.

Additional context

This is my current guess:

providerScopes={{ google: "https://www.googleapis.com/auth/spreadsheets, https://www.googleapis.com/auth/drive.file", }}