Add permalink for prerequisites (#793)

Releases: main, 13.4

Author: linawolf

Documentation/Extensions/CreateOwnExtension.rst

@@ -1,6 +1,6 @@
-.. include:: /Includes.rst.txt
+..  include:: /Includes.rst.txt
 
-.. _create-own-extension:
+..  _create-own-extension:
 
 =========================
 Create your own extension
@@ -9,6 +9,8 @@ Create your own extension
 In TYPO3, extensions allow you to expand the system’s functionality by
 adding new features and customizing behavior according to your project's needs.
 
+..  _create-own-extension-prerequisites:
+
 Prerequisites
 =============