Kept overridden root method and removed original method
Kept overridden root method and removed original method

 - The root method is defined and documented in Base module and
   decorated in Resources module.
 - The documentation in Base module actually talks about method
   signature of decorated method from Resources module.
 - Argument handling was moved to decorated method in
   https://github.com/rails/rails/commit/977455cc2efb94f40b4c0d46d1842be198ed7c4c
   to handle options such as :as with directly passed path parameter.
 - To avoid the confusion, removed original root method from Base module
   and only kept overridden version in Resources module.

 - References - https://github.com/rails/rails/pull/12208 &
                https://github.com/rails/rails/pull/12208#issuecomment-24350897.

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