Minor reword

Author: javiereguiluz

components/cache/adapters/php_files_adapter.rst

@@ -32,12 +32,13 @@ file similar to the following::
     As cache items are included and parsed as native PHP code and due to the way `OPcache`_
     handles file includes, this adapter has the potential to be much faster than other
     filesystem-based caches.
-    
+
 .. caution::
-   If you have configured Opcache to not check the files timestamps 
-   (see https://symfony.com/doc/current/performance.html#performance-dont-check-timestamps),
-   the cached items will not not be invalidated unless you clear the opcache.
-   
+
+    If you have configured OPcache to
+    :ref:`not check the file timestamps <performance-dont-check-timestamps>`
+    the cached items will not not be invalidated unless you clear OPcache.
+
 The PhpFilesAdapter can optionally be provided a namespace, default cache lifetime, and cache
 directory path as constructor arguments::