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Still more to do. Please assist!

JavaScript is spelled with a capital J and S.

It was deprecated in https://github.com/rails/rails/pull/19135.

We're now favoring `public_file_server.headers`.

Should use `public_file_server.enabled` instead.

Clarified that static files will be served from the public directory, where it made sense.

Also removed occurrence of the deprecated `static_cache_control`.

This reverts commit afe67218.

Reason: This change was done by mistake. This option is at the `config`
object not in the `config.assets`.

See
https://github.com/rails/rails/blob/cfb371e96a2789790359ec1db779df490fd253d6/railties/lib/rails/application/configuration.rb#L16

  * files are written to hard "disk" not "disc".

- https://github.com/rails/sprockets/commit/14b3b2eddac4699c64c051888e3801732b9a4418
- https://github.com/rails/sprockets/issues/26

It is very slow since it will precompile even plugins.

Also it is very unlikely that any application will use this patterns
since it is not a good practice to include all assets manually in the
page.

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

With rails/coffee-rails#61 (and #17241), the `.coffee` extension is
favoured over `.js.coffee`. Respectively, with rails/sass-rails#271
`.scss` and `.sass` are favoured over `.css.scss` and `.css.sass`.

Let's update the documentation to reflect that.

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References #18148.

Allow static asset serving from env variable (enhanced!)
Conflicts:
	railties/CHANGELOG.md

fixes #17893

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fixes this :

![http://i.imgur.com/86scI3a.png](http://i.imgur.com/86scI3a.png))