for rails/rails#23431

       modified:   guides/source/asset_pipeline.md
* description of asset combination from apps and gems, e.g. jquery-rails
* after @vipulnsward's related change rails/rails#23479
  correction: --skip-sprockets will prevent all of these gems, not just sass-rails and uglifier

       modified:   guides/source/working_with_javascript_in_rails.md
* noted that rails.js requires the asset pipeline

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Fixes #23322
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Using url helper method of engine in example code,
include `Engine.routes.url_helpers` is required to use helper method of engine.

Follow up to  #23434

For other task has become to use the rails command at doc and test,
I think that routes task also it is better to use the rails command.

The initialization documentation references `rails/commands/command_task.rb`. This appears to be a typo as the file is actually `rails/commands/commands_task.rb`.

Add two options: `-c` and `-g`.
`-g` option returns the urls name, verb and path fields that match the pattern.
`-c` option returns the urls for specific controller.

Fixes #18902, and Fixes #20420

[Anton Davydov & Vipul A M]

Fixes some parts of #23148.

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- sprockets-rails no longer supports customizing cache store after
  rails/sprockets-rails@ecaeb27 using `config.assets.cache_store`.
- Instead we need to configure it using block syntax.
- Fixes #19835.

This reverts commit 96355e87, reversing
changes made to a00c36fe.

See https://github.com/rails/rails/pull/23366#issuecomment-177714429

This is to fill in some missing information as apart of #22931.

It's on purpose that the sample `Message` model inherits from
`ActiveRecord::Base` -- Active Record is not meant to be coupled to
Rails, and we can't guarantee that users outside of the Rails world will
have an `ApplicationRecord` class that inherits from
`ActiveRecord::Base`.

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- inbuilt --> built-in
- Remove random spaces from code examples

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- Various grammar fixes
- Added assertions for update controller action tests
- Added user helper tests
- Fix typos

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Spelling mistake - direcotry > directory

The master branch is required Ruby 2.2.2+, for the Ruby 2.2 is bundled Minitest 5.4.3,
I think backward compatibility code for Minitest 4 is unnecessary.

Pass through correcting api_app.md. The list of included modules and
middleware was tested through a sample API app, and was listed in the
same order an end user would see in their terminal.

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It is not always there anymore

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The documentation team didn't reviewed it yet so it can't be published.

When I was looking for more info regarding this the only way I ended up
on that page was by googling something along the lines of "rails new
api" (as I wanted to find out what are the proper parameters when
generating api app). I think it's beneficial to have that page in table
of contents.