Documentation on default params through routes is unclear

[mmuszynski]

http://guides.rubyonrails.org/routing.html#defining-defaults

It appears that defaults can only be overridden when they are part of the route. See this issue on Stack Overflow:

http://stackoverflow.com/questions/31748306/overriding-default-parameters-in-ruby-on-rails-with-url-query-strings/31749247#31749247

If this is the desired case, can we get a clear mention of it on the documentation page?

[pixeltrix]

This is for security reasons - otherwise url hacking could override the defaults. I'll look at adding a note to the guides.