Update "Layouts and Rendering in Rails" guide [ci skip]
Update "Layouts and Rendering in Rails" guide [ci skip]

  - Remove mention about `ActionView::TemplateHandlers` since this
    module was removed by c1304098cca8a9247a9ad1461a1a343354650843.
    Change word `subclasses` to `nested classes`.
    See c7408a0e40545558872efb4129fe4bf097c9ce2f
  - Remove useless sentence "Beginning with Rails 2, the standard extensions
    are `.erb` for ERB (HTML with embedded Ruby), and `.builder` for Builder (XML generator)."

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