Fix `signed_in?` docs w.r.t. running auth hooks (#4733)
Fix `signed_in?` docs w.r.t. running auth hooks (#4733)

Addresses #4599

The docs previously mentioned that authentication hooks are not run when `signed_in?` is called, when in fact they are. This commit fixes the comment and suggests calling `authenticated?` on warden directly as an alternative for when you _don't_ want to run auth hooks.
plataformatec/devise,Qwiklabs/devise,plataformatec/devise,rubyrider/devise,rubyrider/devise,Qwiklabs/devise,rubyrider/devise