[1.7.x] Fixed versionchanged indentation in docs/.

Backport of 5c517ec218 from master

docs/ref/templates/builtins.txt

@@ -1139,14 +1139,16 @@ If ``this_value`` is 175, ``max_value`` is 200, and ``max_width`` is 100, the
 image in the above example will be 88 pixels wide
 (because 175/200 = .875; .875 * 100 = 87.5 which is rounded up to 88).
 
-.. versionchanged:: 1.7
-
 In some cases you might want to capture the result of ``widthratio`` in a
 variable. It can be useful, for instance, in a :ttag:`blocktrans` like this::
 
     {% widthratio this_value max_value max_width as width %}
     {% blocktrans %}The width is: {{ width }}{% endblocktrans %}
 
+.. versionchanged:: 1.7
+
+    The ability to use "as" with this tag like in the example above was added.
+
 .. templatetag:: with
 
 with