docs: fix PHPDoc types

Author: kenjis

system/BaseModel.php

@@ -1663,7 +1663,7 @@ public function asObject(string $class = 'object')
      * @param bool   $onlyChanged Only Changed Property
      * @param bool   $recursive   If true, inner entities will be cast as array as well
      *
-     * @return array Array
+     * @return array<string, mixed>
      *
      * @throws ReflectionException
      */

system/Model.php

@@ -212,6 +212,7 @@ protected function doFind(bool $singleton, $id = null)
      * @param string $columnName Column Name
      *
      * @return array|null The resulting row of data, or null if no data found.
+     * @phpstan-return list<row_array>|null
      */
     protected function doFindColumn(string $columnName)
     {
@@ -700,7 +701,7 @@ protected function shouldUpdate($data): bool
      * @phpstan-param row_array|object|null $data
      * @param bool $returnID Whether insert ID should be returned or not.
      *
-     * @return false|int|object|string
+     * @return bool|int|string
      * @phpstan-return ($returnID is true ? int|string|false : bool)
      *
      * @throws ReflectionException