Fix deprecation warnings in tests.

Refs #712

Author: ADmad

docs/en/identity-object.rst

@@ -108,10 +108,9 @@ that implements the required interface::
    // Then pass it to the service configuration
    $service = new AuthenticationService([
        'identityClass' => $identityResolver,
-       'identifiers' => [
-           'Authentication.Password'
-       ],
        'authenticators' => [
-           'Authentication.Form'
+           'Authentication.Form' => [
+               'identifier' => 'Authentication.Password',
+           ],
        ]
    ]);

src/AuthenticationService.php

@@ -89,11 +89,10 @@ class AuthenticationService implements AuthenticationServiceInterface, Impersona
      * ```
      * $service = new AuthenticationService([
      *    'authenticators' => [
-     *        'Authentication.Form
+     *        'Authentication.Form' => [
+     *            'identifier' => 'Authentication.Password',
+     *        ],
      *    ],
-     *    'identifiers' => [
-     *        'Authentication.Password'
-     *    ]
      * ]);
      * ```
      *

src/Authenticator/AuthenticatorCollection.php

@@ -46,7 +46,7 @@ public function __construct(IdentifierCollection $identifiers, array $config = [
         if ($identifiers->count() > 0) {
             deprecationWarning(
                 '3.3.0',
-                'loadIdentifier() usage is deprecated. Directly pass Identifier to Authenticator.',
+                'loadIdentifier() usage is deprecated. Directly pass `\'identifier\'` config to the Authenticator.',
             );
         }
 
@@ -70,7 +70,7 @@ protected function _create(object|string $class, string $alias, array $config):
             } else {
                 deprecationWarning(
                     '3.3.0',
-                    'loadIdentifier() usage is deprecated. Directly pass `\'identifier\'` config to Authenticator.',
+                    'loadIdentifier() usage is deprecated. Directly pass `\'identifier\'` config to the Authenticator.',
                 );
             }