Better documentation for passing extra parameters to routes

I just spend a while trying to figure this out - the documentation in routing.rb is out of date.
A route like:

map.connect ':controller/:action/:id', :action => 'show', :defaults => { :page => 'Dashboard' }

will blow up with an error. (`assign_route_options': page: No matching segment exists; cannot assign default (ArgumentError)).

Turns out, after digging around, that the correct way to do this is now:

map.connect ':controller/:action/:id', :action => 'show', :page => 'Dashboard'

I just spend a while trying to figure this out - the documentation in
routing.rb is out of date.

Please do add a patch to docrails with all the information you've
learned. Thanks!