fixed markup

doc/templates.rst

@@ -482,16 +482,16 @@ exist:
 
   .. code-block:: jinja
 
-    # keys as string
+    {# keys as string #}
     { 'foo': 'foo', 'bar': 'bar' }
 
-    # keys as names (equivalent to the previous hash) -- as of Twig 1.5
+    {# keys as names (equivalent to the previous hash) -- as of Twig 1.5 #}
     { foo: 'foo', bar: 'bar' }
 
-    # keys as integer
+    {# keys as integer #}
     { 2: 'foo', 4: 'bar' }
 
-    # keys as expressions (the expression must be enclosed into parentheses) -- as of Twig 1.5
+    {# keys as expressions (the expression must be enclosed into parentheses) -- as of Twig 1.5 #}
     { (1 + 1): 'foo', (a ~ 'b'): 'bar' }
 
 * ``true`` / ``false``: ``true`` represents the true value, ``false``