fix: remove deprecated string options on examples

Author: RomainLanz

templates/validator.txt

@@ -11,13 +11,13 @@ export default class {{ filename }} {
    * 1. The username must be of data type string. But then also, it should
    *    not contain special characters or numbers.
    *    ```
-   *     schema.string({}, [ rules.alpha() ])
+   *     schema.string([ rules.alpha() ])
    *    ```
    *
    * 2. The email must be of data type string, formatted as a valid
    *    email. But also, not used by any other user.
    *    ```
-   *     schema.string({}, [
+   *     schema.string([
    *       rules.email(),
    *       rules.unique({ table: 'users', column: 'email' }),
    *     ])