Update the ducumentation about the before_eager_load callback [ci skip]

railties/lib/rails/application.rb

@@ -46,7 +46,7 @@ module Rails
   #       One by one, each engine sets up its load paths, routes and runs its config/initializers/* files.
   #   9)  Custom Railtie#initializers added by railties, engines and applications are executed
   #   10) Build the middleware stack and run to_prepare callbacks
-  #   11) Run config.before_eager_load and eager_load if cache classes is true
+  #   11) Run config.before_eager_load and eager_load! if eager_load is true
   #   12) Run config.after_initialize callbacks
   #
   class Application < Engine