Fix link text

Documentation/ApiOverview/Typo3CoreEngine/Files/Index.rst

@@ -213,7 +213,7 @@ It is unlikely that you will need to use this internally in your
 scripts like you will need :php:`\TYPO3\CMS\Core\DataHandling\DataHandler`. It
 is fairly uncommon to need the file manipulations in own scripts unless you
 make a special application. Therefore the most typical usage of this API is
-from :ref:`\TYPO3\CMS\Backend\Controller\File\FileController <tce-file-api>`
+from :ref:`\\TYPO3\\CMS\Backend\\Controller\\File\\FileController <tce-file-api>`
 and the core scripts that are activated by the "File > List" module.
 
 However, if needed, this is an example of how to initialize usage. It is taken