Issue #3386233 by yash.rode, cmlara: Returntype incorrect for UnitTestCase::getConfigFactoryStub()

(cherry picked from commit dcd0ec71)

core/tests/Drupal/Tests/UnitTestCase.php

@@ -85,9 +85,8 @@ public function __get(string $name) {
    *   configuration object names and whose values are key => value arrays for
    *   the configuration object in question. Defaults to an empty array.
    *
-   * @return \PHPUnit\Framework\MockObject\MockBuilder
-   *   A MockBuilder object for the ConfigFactory with the desired return
-   *   values.
+   * @return \PHPUnit\Framework\MockObject\MockObject|\Drupal\Core\Config\ConfigFactoryInterface
+   *   A mock configuration factory object.
    */
   public function getConfigFactoryStub(array $configs = []) {
     $config_get_map = [];