Merge branch '3.4' into 4.4

* 3.4:
  Update versioning.rst

Author: OskarStark

frontend/encore/versioning.rst

@@ -66,7 +66,7 @@ like normal:
 
 .. code-block:: html+twig
 
-    <img src="{{ asset('build/images/logo.png') }}">
+    <img src="{{ asset('build/images/logo.png') }}" alt="ACME logo">
 
 Troubleshooting
 ---------------