Fix a ContentNegotiation test description

actionpack/test/controller/new_base/content_negotiation_test.rb

@@ -25,7 +25,7 @@ class TestContentNegotiation < Rack::TestCase
       assert_body "Hello world text/html!"
     end
 
-    test "A js or */* Accept header on xhr will return HTML" do
+    test "A js or */* Accept header on xhr will return JavaScript" do
       get "/content_negotiation/basic/hello", headers: { "HTTP_ACCEPT" => "text/javascript, */*" }, xhr: true
       assert_body "Hello world text/javascript!"
     end