Fix the chain adapter exemple on object creation

Author: blazarecki

components/cache/adapters/chain_adapter.rst

@@ -17,14 +17,13 @@ lifetime as its constructor arguments::
 
     use Symfony\Component\Cache\Adapter\ApcuAdapter;
 
-    $cache = new ChainAdapter([
-
+    $cache = new ChainAdapter(
         // The ordered list of adapters used to fetch cached items
         array $adapters,
 
         // The max lifetime of items propagated from lower adapters to upper ones
         $maxLifetime = 0
-    ]);
+    );
 
 .. note::