Reformatted trans_default_domain versionadded block

Author: wouterj

book/translation.rst

@@ -812,16 +812,19 @@ texts* and complex expressions:
             {{ message|trans|raw }}
             {{ '<h3>bar</h3>'|trans|raw }}
 
-.. versionadded:: 2.1
-     You can now set the translation domain for an entire Twig template with a
-     single tag:
+.. tip::
+
+    You can set the translation domain for an entire Twig template with a single tag:
 
-     .. code-block:: jinja
+    .. code-block:: jinja
+
+           {% trans_default_domain "app" %}
 
-            {% trans_default_domain "app" %}
+    Note that this only influences the current template, not any "included"
+    templates (in order to avoid side effects).
 
-     Note that this only influences the current template, not any "included"
-     templates (in order to avoid side effects).
+.. versionadded:: 2.1
+    The ``trans_default_domain`` tag is new in Symfony2.1
 
 PHP Templates
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