Sure this is `destroy` method of PhotosController, but in this chapter
these methods which mapped by the router are called "action".
For example:

```ruby
get '/patients/:id', to: 'patients#show'
```

is described to dispatch "controller's `show` action".

Fixes #21085.

Add descriptions about `ActiveRecord::Base#to_param` to

* `ActionDispatch::Routing::Base#match`
* Overriding Named Route Parameters (guide)

When passes `:param` to route definision, always `to_param` method of
related model is overridden to constructe an URL by passing these
model instance to named_helper.

[Robin Dupret & Shunsuke Aida]

sudden ending of form looks incomplete and catches [ci skip]

This adds instructions for routing to rack applications with mount instead of match.

I just spent an unreasonable amount of time staring at this, hopefully the next person will save some time. It's possible that the docs should simply advise people to use mount and leave out the match method but I don't know enough about the differences in the two approaches to assert that definitively.

On "Controller Namespaces and Routing" section of the "Rails Routing from the Outside In" , the examples are using "AritclesController" as an example of a controller, to show different organizers. But on the line 232, it incorrectly uses "PostsController" instead of "AritclesController".

- Changed `IN` to `ON` in all note sentences in guides.

References #18148.

options, and wrapped to 80 chars. [ci skip]

[ci skip]

References to ``AppName::Application` removed in favour of ``Rails.application``
as generated with a new rails 4.1 app.

[ci skip]

Fixes #12777

Grammatical tense correction: "There exists two" => "There exist two".
Plurality correction: "can be reused inside others resources" => "can be reused inside other resources".

* Indent after private/protected
* Ruby >= 1.9 syntax for hashes
* Prefer method { do_stuff } instead of method{do_stuff} for single-line blocks.

[ci skip]

Revert "change additional 'RESTful' routes to 'resourceful' routes as the additional actions may potentially get you farther away from RESTfulness"

This reverts commit 382419d2.

change additional 'RESTful' routes to 'resourceful' routes as the additional actions may potentially get you farther away from RESTfulness