docs: add @return

Author: kenjis

src/Models/UserModel.php

@@ -261,6 +261,8 @@ public function insert($data = null, bool $returnID = true)
      * @param array|int|string|null $id
      * @param array|User            $data
      *
+     * @return true if the update is successful
+     *
      * @throws ValidationException
      */
     public function update($id = null, $data = null): bool
@@ -301,6 +303,8 @@ public function update($id = null, $data = null): bool
      *
      * @param array|User $data
      *
+     * @return true if the save is successful
+     *
      * @throws ValidationException
      */
     public function save($data): bool