add a possible cause for `OAuthCreateAccount` error

[a4amado]

English is not my first language please correct ant grammatical errors I made.

This bug was tough for me because I'm a self-taught noob. I hope to give people a hint that will avoid them spending 4 days trying to figure out what's going on.

☕️ Reasoning

Just want to help

What changes are being made? What feature/bug is being fixed here? add a possible case to OAuthCreateAccount docs

🧢 Checklist

• [x] Documentation

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• Contributing to Open Source

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Name	Status	Preview	Updated
next-auth	✅ Ready (Inspect)	Visit Preview	Sep 27, 2022 at 10:45PM (UTC)