minor symfony#14578 [Securty] PhpDoc fix in AbstractRememberMeServices (MacDada)

This PR was merged into the 2.3 branch.

Discussion
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[Securty] PhpDoc fix in AbstractRememberMeServices

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | no
| License       | MIT
| Doc PR        | no

All extending classes return `UserInterface`, not `TokenInterface`:

* https://github.com/symfony/symfony/blob/2.3/src/Symfony/Component/Security/Http/RememberMe/TokenBasedRememberMeServices.php#L64
* https://github.com/symfony/symfony/blob/2.3/src/Symfony/Component/Security/Http/RememberMe/PersistentTokenBasedRememberMeServices.php#L116

And `AbstractRememberMeServices` actually requires the return value to be `UserInterface`:

```
$user = $this->processAutoLoginCookie($cookieParts, $request);

if (!$user instanceof UserInterface) {
    throw new \RuntimeException('processAutoLoginCookie() must return a UserInterface implementation.');
}
```

Commits
-------

a73d2cc PhpDoc fix in AbstractRememberMeServices

Author: fabpot

src/Symfony/Component/Security/Http/RememberMe/AbstractRememberMeServices.php

@@ -217,7 +217,7 @@ final public function loginSuccess(Request $request, Response $response, TokenIn
      * @param array   $cookieParts
      * @param Request $request
      *
-     * @return TokenInterface
+     * @return UserInterface
      */
     abstract protected function processAutoLoginCookie(array $cookieParts, Request $request);