[TASK] Use request attribute instead of TSFE in page title API example

The TypoScriptFrontendController has been marked as deprecated with TYPO3 v13.4.
Therefore, this example has been adjusted to avoid calling TSFE methods.

Additionally:

- The whole class is marked as readonly.
- The "do something" comment is removed as it does not serve any purpose here.

Related: TYPO3-Documentation/Changelog-To-Doc#1074
Releases: main, 13.4

Author: brotkrueml

Documentation/ApiOverview/Seo/PageTitleApi.rst

@@ -80,6 +80,10 @@ example the site title, you can implement a page title provider as follows:
 ..  literalinclude:: _ExampleWebsiteTitle/_WebsiteTitleProvider.php
     :caption: EXT:my_sitepackage/Classes/PageTitle/WebsiteTitleProvider.php
 
+..  versionchanged:: 13.0
+    The :ref:`frontend.page.information attribute <typo3-request-attribute-frontend-page-information>`
+    has been introduced.
+
 As we need to :ref:`inject <DependencyInjection>` the class :php:`SiteFinder`
 to retrieve the current site configuration, we must make the new page title
 provider :ref:`public <knowing-what-to-make-public>`:

Documentation/ApiOverview/Seo/_ExampleWebsiteTitle/_WebsiteTitleProvider.php

@@ -4,30 +4,33 @@
 
 namespace MyVendor\MySitepackage\PageTitle;
 
+use Psr\Http\Message\ServerRequestInterface;
 use TYPO3\CMS\Core\PageTitle\PageTitleProviderInterface;
 use TYPO3\CMS\Core\Site\SiteFinder;
-use TYPO3\CMS\Frontend\Controller\TypoScriptFrontendController;
+use TYPO3\CMS\Frontend\Page\PageInformation;
 
-final class WebsiteTitleProvider implements PageTitleProviderInterface
+final readonly class WebsiteTitleProvider implements PageTitleProviderInterface
 {
     public function __construct(
-        private readonly SiteFinder $siteFinder,
+        private SiteFinder $siteFinder,
     ) {}
 
     public function getTitle(): string
     {
-        $site = $this->siteFinder->getSiteByPageId($this->getTypoScriptFrontendController()->page['uid']);
+        /** @var PageInformation $pageInformation */
+        $pageInformation = $this->getRequest()->getAttribute('frontend.page.information');
+
+        $site = $this->siteFinder->getSiteByPageId($pageInformation->getId());
         $titles = [
-            $this->getTypoScriptFrontendController()->page['title'],
+            $pageInformation->getPageRecord()['title'],
             $site->getAttribute('websiteTitle'),
         ];
 
-        // do something
         return implode(' - ', $titles);
     }
 
-    private function getTypoScriptFrontendController(): TypoScriptFrontendController
+    private function getRequest(): ServerRequestInterface
     {
-        return $GLOBALS['TSFE'];
+        return $GLOBALS['TYPO3_REQUEST'];
     }
 }