[RFR] Docs: Move built-in validators above custom validation

[heyfife]

I put the easy way to do validation first followed by advanced, custom validation methods.

We had custom required() validators all over our code since that's the first way validation is described in the docs. Hopefully this reordering will help others avoid the extra, custom work when built-in functionality already exists to cover common cases.

[fzaninotto]

Sorry, the documentation doesn't make sense the way you ordered it, as per Input validation is introduced after the list of existing validators. Besides, the introduction of the "Validation" part still mentions global validation before per field validation.

[fzaninotto]

Bump, can you update your PR?

[heyfife]

Yes. Will do this week.

[fzaninotto]

Again, this doesn't make sense, and the repetition of the validators makes the doc harder to read.

[heyfife]

I agree, it did not make sense. I left in the built-in validation section at the top and meant to remove it. It should be clear now.

[fzaninotto]

Thanks!