docs: remove @throws in ValidationInterface

I don't see it is useful.

Author: kenjis

system/Validation/ValidationInterface.php

@@ -12,7 +12,6 @@
 namespace CodeIgniter\Validation;
 
 use CodeIgniter\HTTP\RequestInterface;
-use CodeIgniter\Validation\Exceptions\ValidationException;
 
 /**
  * Expected behavior of a validator
@@ -94,8 +93,6 @@ public function reset(): ValidationInterface;
      * same format used with setRules(). Additionally, check
      * for {group}_errors for an array of custom error messages.
      *
-     * @throws ValidationException
-     *
      * @return array
      */
     public function loadRuleGroup(?string $group = null);