Fix typo in actionview error message

actionview/lib/action_view/helpers/url_helper.rb

@@ -622,7 +622,7 @@ def method_tag(method)
         def to_form_params(attribute, namespace = nil)
           attribute = if attribute.respond_to?(:permitted?)
             unless attribute.permitted?
-              raise ArgumentError, "Attempting to generate a buttom from non-sanitized request parameters!" \
+              raise ArgumentError, "Attempting to generate a button from non-sanitized request parameters!" \
                 " Whitelist and sanitize passed parameters to be secure."
             end