add phpdoc for FunctionalTester

tests/_support/FunctionalTester.php

@@ -29,6 +29,9 @@ class FunctionalTester extends \Codeception\Actor
      * Define custom actions here
      */
 
+    /**
+     * Login as default administrator
+     */
     public function loginAsAdmin(): void
     {
         $I = $this;
@@ -37,6 +40,12 @@ class FunctionalTester extends \Codeception\Actor
         $I->seeAuthentication('admin');
     }
 
+    /**
+     * Go to a specific route and check if admin guard is applied on it
+     *
+     * @param string     $name name of the route
+     * @param array|null $params params the route will be created with
+     */
     public function amOnAdminRoute(string $name, array $params = null): void
     {
         $I = $this;