Write config.threasafe! deprecated waning in config/environments/production.rb #8232

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@@ -66,6 +66,9 @@
# config.action_mailer.raise_delivery_errors = false
# Enable threaded mode.
+ # config.threadsafe! is deprecated. Rails application behave
+ # by default as thread safe in production as long as config.cache_classes and
+ # config.eager_load are set to true.
# config.threadsafe!
# Enable locale fallbacks for I18n (makes lookups for any locale fall back to