[TASK] Add reference to BeforeLoadedPageTsConfigEvent

Related: TYPO3-Documentation/Changelog-To-Doc#645
Releases: main

Documentation/PageTsconfig/Index.rst

@@ -1,7 +1,7 @@
-.. include:: /Includes.rst.txt
-.. index:: ! Page TSconfig
-.. _pagetsconfig:
-.. _pagetoplevelobjects:
+..  include:: /Includes.rst.txt
+..  index:: ! Page TSconfig
+..  _pagetsconfig:
+..  _pagetoplevelobjects:
 
 =======================
 Page TSconfig Reference
@@ -18,16 +18,18 @@ Note that the page TSconfig can be overridden on a user and group basis by
 user TSconfig again, for details, see section
 :ref:`Overriding Page TSconfig in User TSconfig <userrelationshiptovaluessetinpagetsconfig>`.
 
+The PSR-14 event :ref:`t3coreapi:BeforeLoadedPageTsConfigEvent` can be used to
+add global static page TSconfig before anything else is loaded.
 
-.. toctree::
-   :maxdepth: 5
-   :titlesonly:
+..  toctree::
+    :maxdepth: 5
+    :titlesonly:
 
-   Mod
-   Options
-   Rte
-   TcaDefaults
-   TceForm
-   TceMain
-   Templates
-   Tx
+    Mod
+    Options
+    Rte
+    TcaDefaults
+    TceForm
+    TceMain
+    Templates
+    Tx