add missing ";"

Author: Tomáš Votruba

components/cache/psr6_psr16_adapters.rst

@@ -37,7 +37,7 @@ instead. No problem! The Cache component provides the
 this use-case::
 
     use Symfony\Component\Cache\Simple\FilesystemCache;
-    use Symfony\Component\Cache\Adapter\SimpleCacheAdapter
+    use Symfony\Component\Cache\Adapter\SimpleCacheAdapter;
 
     // the PSR-16 cache object that you want to use
     $psr16Cache = new FilesystemCache();