docs: add callout about eager-validation

docs/content/3.forms/10.form.md

@@ -161,6 +161,10 @@ async function onSubmit (event: FormSubmitEvent<any>) {
 
 The Form component automatically triggers validation upon `submit`, `input`, `blur` or `change` events. This ensures that any errors are displayed as soon as the user interacts with the form elements. You can control when validation happens this using the `validate-on` prop.
 
+::callout{icon="i-heroicons-light-bulb"}
+Note that the `input` event is not triggered on the [`Input`](/forms/input) and [`Textarea`](/forms/textarea) components until after the initial `blur` event. This is to prevent the form from being validated as the user is typing. You can override this behavior by setting the `eagerValidation` prop on these components to `true`.
+::
+
 ::component-example
 ---
 component: 'form-example-elements'