[API] Generator: Fix bug with unnecessary new line

Author: picandocodigo

elasticsearch-api/utils/thor/generate_source.rb

@@ -222,7 +222,7 @@ def docs_helper(name, info)
         info['type'] = 'String' if info['type'] == 'enum' # Rename 'enums' to 'strings'
         tipo = info['type'] ? info['type'].capitalize : 'String'
         description = info['description'] ? info['description'].strip : '[TODO]'
-        options = info['options'] ? "\n    #   (options: #{info['options'].join(', '.strip)})\n" : ''
+        options = info['options'] ? "\n    #   (options: #{info['options'].join(', '.strip)})" : nil
         required = info['required'] ? ' (*Required*)' : ''
         deprecated = info['deprecated'] ? ' *Deprecated*' : ''
         "# @option arguments [#{tipo}] :#{name} #{description} #{required} #{deprecated} #{options}\n"