fix: Button text

Author: sadobass

resources/docs/6.x/forms.md

@@ -101,7 +101,7 @@ Widget view(BuildContext context) {
     body: SafeArea(
       child: NyForm(
         form: form, 
-        footer: Button.primary(child: "Submit", submitForm: (form, (data) {
+        footer: Button.primary(text: "Submit", submitForm: (form, (data) {
               printInfo(data);
           }),
         ),
@@ -984,4 +984,4 @@ NyForm(
 - The `loading` widget is only shown when the form is in a loading state.
 - The `onChanged` callback provides both the changed field name and the complete form data.
 - When `locked` is true, the form becomes non-interactive but still displays values.
-- `header` and `footer` widgets are optional and will only be displayed if provided.
+- `header` and `footer` widgets are optional and will only be displayed if provided.