fixed docs

doc/tests/empty.rst

@@ -1,7 +1,8 @@
 ``empty``
 =========
 
-``empty`` checks if a variable is an empty string, an empty array, an empty hash, exactly ``false``, exactly ``null``:
+``empty`` checks if a variable is an empty string, an empty array, an empty
+hash, exactly ``false``, or exactly ``null``:
 
 .. code-block:: jinja
 
@@ -9,6 +10,3 @@
     {% if foo is empty %}
         ...
     {% endif %}
-
-.. _Countable: http://php.net/manual/en/class.countable.php
-.. _count: http://php.net/manual/en/function.count.php