Added note to fix symfony#10343

Nyholm · Nyholm · commit f8e6f191ec68 · 2019-04-08T19:55:18.000+02:00
diff --git a/cache.rst b/cache.rst
@@ -527,6 +527,11 @@ achieved by specifying the adapter.
             ],
         ]);
 
+.. note::
+
+    The interface :class:`Symfony\\Contracts\\Cache\\TagAwareCacheInterface`` is
+    autowired to the ``cache.app`` service.
+
 Clearing the Cache
 ------------------
 
