reworded docs

doc/filters/number_format.rst

@@ -17,15 +17,15 @@ separator using the additional arguments:
 .. code-block:: jinja
 
     {{ 9800.333|number_format(2, '.', ',') }}
-    
-If you want to format negative numbers, you will need to wrap the number with parantheses. This is due to the `precedence of operators`_ inside Twig
+
+To format negative numbers, wrap the number with parentheses (needed because of
+Twig's :ref:`precedence of operators <twig-expressions>`:
 
 .. code-block:: jinja
 
     {{ -9800.333|number_format(2, '.', ',') }} {# outputs : -9 #}
     {{ (-9800.333)|number_format(2, '.', ',') }} {# outputs : -9.800,33 #}
 
-
 If no formatting options are provided then Twig will use the default formatting
 options of:
 
@@ -54,5 +54,3 @@ Arguments
 * ``thousand_sep``:   The character(s) to use for the thousands separator
 
 .. _`number_format`: http://php.net/number_format
-.. _`precedence of operators`: https://twig.sensiolabs.org/doc/2.x/templates.html#expressions
-