Improve highlighting of Ruby code

[afuno]

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I have this example code:

class PymentsService::Send < ApplicationService::Base
  input :invoice_numbers,
        type: String,
        array: true,
        must: {
          be_6_characters: {
            is: ->(value:) { value.all? { |id| id.size == 6 } }
          }
        }
​
  # ...
end

In the created documentation, there is not quite clear highlighting. An example can be seen here.

You can also compare it to how GitHub does it.