lang/org: different bullets for nested plain lists

modules/lang/org/config.el

@@ -109,6 +109,8 @@ Is relative to `org-directory', unless it is absolute. Is used in Doom's default
         org-hide-leading-stars t
         org-image-actual-width nil
         org-imenu-depth 8
+        ;; Sub-lists should have different bullets
+        org-list-demote-modify-bullet '(("+" . "-") ("-" . "+") ("*" . "+") ("1." . "a."))
         org-priority-faces
         '((?A . error)
           (?B . warning)