docs: update docs (#4466)

* chore: fixed known issues with form components

* docs: add vben form doc

apps/web-ele/src/adapter/form.ts

@@ -73,7 +73,7 @@ setupVbenForm<FormComponentType>({
   },
   defineRules: {
     required: (value, _params, ctx) => {
-      if ((!value && value !== 0) || value.length === 0) {
+      if (value === undefined || value === null || value.length === 0) {
         return $t('formRules.required', [ctx.label]);
       }
       return true;