This package allows you to set both single and multi line comment
variables like ‘comment-start’ or ‘comment-end’ etc.

Configuration example for go-mode:

  After this configuration your ‘comment-dwim’ will be multi line
  comment.

  (setq comment-style 'extra-line)

  (add-hook 'go-mode-hook
    (lambda ()
      (setq-local commenter-config
          '((single
             . ((comment-start      . "//")
                (comment-end        . "")
                (comment-start-skip . "\\(//+\\|/\\*+\\)\\s *")))
            (multi
             . ((comment-start      . "/* ")
                (comment-end        . " */")
                (comment-start-skip . "/\\*")
                (comment-end-skip   . "\\*/")
                (comment-continue   . " * ")
                (comment-padding    . " ")
                (comment-multi-line . t)))))

      (commenter-setup)))