feat(ess): roxygen: indentation on RET

Fix: #6455

modules/lang/ess/config.el

@@ -67,6 +67,8 @@
             [up]   #'comint-next-input
             [down] #'comint-previous-input
             [C-return] #'ess-eval-line))
+        (:map ess-roxy-mode-map
+         :i "RET" #'ess-indent-new-comment-line)
 
         :map ess-mode-map
         :n [C-return] #'ess-eval-line