emacs: change mmm-mode config

emacs/init.el

@@ -117,24 +117,13 @@
   (defvaralias 'json-reformat:indent-width 'tab-width))
 
 (use-package mmm-mode
-  :ensure t
+  :ensure t)
+
+(use-package mmm-auto
   :init
   (setq mmm-submode-decoration-level 0)
   :config
-  (require 'mmm-auto)
-  (mmm-add-group 'rust-doc
-   '((rust-doc-line
-      :submode markdown-mode
-      :face mmm-comment-submode-face
-      :front "///\s+"
-      :back "\n")
-     (rust-doc-block
-      :submode markdown-mode
-      :face mmm-comment-submode-face
-      :front "/\\*\\*"
-      :back "\\*\\*/")))
-  (mmm-add-mode-ext-class 'ruby-mode nil 'here-doc)
-  (mmm-add-mode-ext-class 'rust-mode nil 'rust-doc))
+  (mmm-add-mode-ext-class 'ruby-mode nil 'here-doc))
 
 (use-package python
   :init
@@ -177,7 +166,6 @@
 
 (use-package rust-mode
   :ensure t
-  :hook ((rust-mode . mmm-mode))
   :init
   (defvaralias 'rust-indent-offset 'tab-width))