Don't require using application_name before options

Before this commit options for `rails new` and `rails plugin new` had to
be passed in a strict order, trying to execute a following command:

    rails new -J path/to/app

resulted in an error.

This commit fixes the situation and allows to pass path to app anywhere
after `new`
Fixing comment typo in ActionController::Base
Merge pull request #12223 from adomokos/fixing_typo

Fixing comment typo in ActionController::Base
Removing ActiveSupport::Concern, it's not needed
Merge pull request #12225 from adomokos/no_need_for_active_support_concern

Removing ActiveSupport::Concern, it's not needed
[ci skip] Update plugins.md

Highlighted code.
Merge pull request #12231 from harshadsabne/master

[ci skip] Update plugins.md
[ci skip] Consistency wording of 9.6 in form_helpers.md

Chapter 9 is giving a user and set of addresses example.
So 'Add a new address' would be more consistent.
Also change the javascript to JavaScript.
Merge pull request #12239 from JuanitoFatas/form_helpers

[ci skip] Consistency wording of 9.6 in form_helpers.md