Add a example for callback url in docs for all providers

[TakshakRamteke]

What is the improvement or update you wish to see?

I recently noticed this while working with the auth0 provider that

Only the docs for google provider tell us about what callback / allowed redirect to use

while it is something pretty simple and is mentioned pretty early in the docs

In my humble opinion I believe that it'd be so much more usefull and convenient if we could list them out on the docs for each provider

not only that but if we do this it'll make the docs look a lot more consistent as well

With all due respect, Please let me know you're thought's I'd be really happy to contribute this one

Is there any context that might help us understand?

E.g.

Here on the doc for google provider in the configuration section we list what callback's to use for the allowed redirect url's

Where as on the docs for auth0, gitlab , etc.. we didn't mention it at all

Does the docs page already exist? Please link to it.

https://next-auth.js.org/providers/google

[dryhurst]

@TakshakRamteke feel free to open a PR for these changes.

[Shudhanshu-Choudhary]

I would like to contribute on this.

[ThangHuuVu]

Go for it @shudanshus198! 🙌

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