Merge pull request rails#6968 from guilleiguaran/update-test-helper

CSV fixtures aren't supported by default anymore, update generated test_helper.rb to reflect that

railties/lib/rails/generators/rails/app/templates/test/test_helper.rb

@@ -6,7 +6,7 @@ class ActiveSupport::TestCase
 <% unless options[:skip_active_record] -%>
   ActiveRecord::Migration.check_pending!
 
-  # Setup all fixtures in test/fixtures/*.(yml|csv) for all tests in alphabetical order.
+  # Setup all fixtures in test/fixtures/*.yml for all tests in alphabetical order.
   #
   # Note: You'll currently still have to declare fixtures explicitly in integration tests
   # -- they do not yet inherit this setting