Add permalink for prerequisites (#793) (#800)

Releases: main, 13.4
(cherry picked from commit cbe2147)

Co-authored-by: Lina Wolf <48202465+linawolf@users.noreply.github.com>

Author: typo3-docs-backport-bot[bot]

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
 =============