[Documentation] error parameter not described

[staeter]

I can't find the description of what the error parameter does for the different fields.

[MangelMaxime]

Hello @STTR13,

you can find it used in the SignUp example.

In this example, it is used to display server side errors.

composable-form/examples/src/Page/Signup.elm

Lines 141 to 147 in f1df4f5

	, error =
	\{ email, errors } ->
	if Just email == Maybe.map .value errors.email then
	Maybe.map .error errors.email
	else
	Nothing

I think you can also use it, to generate error based on other fields values.

For example, if you are asking for an interval and what to check that the endDate is set after the startDate.