Update comment on Devise.configure_warden
Update comment on Devise.configure_warden

The existing comment seems to be either outdated or obscure. I interpret it as meaning that configure_warden! is invoked by an 'initializer' block in class Devise::Engine, i.e. in lib/devise/rails.rb. However, as far as I can tell the only time the method is invoked is when ActionDispatch::Routing::RouteSet#finalize! is called, and this is aliased by devise to finalize_with_devise!.
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