Revert "Revert "update doc, assert_template also accepts false""

Reason: docrails policy is very strict about code. No matter how
innocent the change, if it is not documentation it needs to go
through a PR to rails/rails.

Plase see the warning box at the bottom of

    http://edgeguides.rubyonrails.org/contributing_to_ruby_on_rails.html#contributing-to-the-rails-documentation

This reverts commit e1c5d24369440857de1402d61c85d982b29d8019.

1 files changed, 1 insertions, 1 deletions

diff --git a/actionpack/lib/action_controller/test_case.rb b/actionpack/lib/action_controller/test_case.rb
index 2962ce47f9..a79c139b4d 100644
--- a/actionpack/lib/action_controller/test_case.rb
+++ b/actionpack/lib/action_controller/test_case.rb
@@ -170,7 +170,7 @@ module ActionController
             "Expected no partials to be rendered"
         end
       else
-        raise ArgumentError, "assert_template only accepts a String, Symbol, Hash, Regexp, or nil"
+        raise ArgumentError, "assert_template only accepts a String, Symbol, Hash, Regexp, nil or false"
       end
     end
   end