doc: fix spelling in docstring.

Author: rouilj

roundup/cgi/templating.py

@@ -3291,7 +3291,7 @@ def indexargs_form(self, columns=1, sort=1, group=1, filter=1,
 
             This routine generates an html form with hidden elements.
             If you want to have visible form elements in your tal/jinja
-            generated templates use the exclude aray to list the names for
+            generated templates use the exclude array to list the names for
             these elements. This wll prevent the function from creating
             these elements in its output.
         """