restores some double newlines deleted in ae87217

These were intentional, see

https://github.com/rails/rails/pull/30061#issuecomment-320068368

activestorage/app/controllers/active_storage/disk_controller.rb

@@ -33,6 +33,7 @@ class ActiveStorage::DiskController < ActionController::Base
       ActiveStorage::Blob.service
     end
 
+
     def decode_verified_key
       ActiveStorage.verifier.verified(params[:encoded_key], purpose: :blob_key)
     end
@@ -41,6 +42,7 @@ class ActiveStorage::DiskController < ActionController::Base
       params[:disposition].presence_in(%w( inline attachment )) || "inline"
     end
 
+
     def decode_verified_token
       ActiveStorage.verifier.verified(params[:encoded_token], purpose: :blob_token)
     end

activestorage/app/models/active_storage/blob.rb

@@ -59,6 +59,7 @@ class ActiveStorage::Blob < ActiveRecord::Base
     end
   end
 
+
   # Returns a signed ID for this blob that's suitable for reference on the client-side without fear of tampering.
   # It uses the framework-wide verifier on <tt>ActiveStorage.verifier</tt>, but with a dedicated purpose.
   def signed_id
@@ -120,6 +121,7 @@ class ActiveStorage::Blob < ActiveRecord::Base
     ActiveStorage::Variant.new(self, ActiveStorage::Variation.new(transformations))
   end
 
+
   # Returns the URL of the blob on the service. This URL is intended to be short-lived for security and not used directly
   # with users. Instead, the +service_url+ should only be exposed as a redirect from a stable, possibly authenticated URL.
   # Hiding the +service_url+ behind a redirect also gives you the power to change services without updating all URLs. And
@@ -162,6 +164,7 @@ class ActiveStorage::Blob < ActiveRecord::Base
     service.download key, &block
   end
 
+
   # Deletes the file on the service that's associated with this blob. This should only be done if the blob is going to be
   # deleted as well or you will essentially have a dead reference. It's recommended to use the +#purge+ and +#purge_later+
   # methods in most circumstances.

activestorage/app/models/active_storage/variant.rb

@@ -65,6 +65,7 @@ class ActiveStorage::Variant
     service.url key, expires_in: expires_in, disposition: disposition, filename: blob.filename, content_type: blob.content_type
   end
 
+
   private
     def processed?
       service.exist?(key)