Added doc links for django.utils.html.escape().

docs/ref/contrib/admin/index.txt

@@ -422,7 +422,7 @@ subclass::
         Note that this value is *not* HTML-escaped when it's displayed in
         the admin interface. This lets you include HTML if you so desire.
         Alternatively you can use plain text and
-        ``django.utils.html.escape()`` to escape any HTML special
+        :func:`django.utils.html.escape` to escape any HTML special
         characters.
 
 .. attribute:: ModelAdmin.filter_horizontal

docs/ref/models/fields.txt

@@ -270,7 +270,7 @@ desire. For example::
     help_text="Please use the following format: <em>YYYY-MM-DD</em>."
 
 Alternatively you can use plain text and
-``django.utils.html.escape()`` to escape any HTML special characters. Ensure
+:func:`django.utils.html.escape` to escape any HTML special characters. Ensure
 that you escape any help text that may come from untrusted users to avoid a
 cross-site scripting attack.