Issue #3275860: Mark our modules as experimental

tests/src/Unit/EnsureExperimentalTest.php

 <?php
 
-namespace Drupal\Tests\automatic_updates_extensions\Unit;
+namespace Drupal\Tests\automatic_updates\Unit;
 
 use Drupal\Tests\UnitTestCase;
 use Symfony\Component\Yaml\Yaml;
 
 /**
- * Test to ensure the modules are experimental.
+ * Tests to ensure the modules are experimental.
  *
  * @group automatic_updates
  */
 class EnsureExperimentalTest extends UnitTestCase {
 
   /**
-   * Tests that modules are experimental.
+   * Tests that the modules are experimental.
    */
   public function testModulesExperimental() {
     $info_files = [