Add FIXMEs to def-setting!'s

They will be removed on the 2.1.1 release.

modules/feature/lookup/autoload/devdocs.el

@@ -11,6 +11,7 @@ See `devdocs-alist' for the defaults. "
     (dolist (mode (doom-enlist modes))
       (setf (alist-get mode devdocs-alist) docset))))
 
+;; FIXME obsolete :devdocs
 ;;;###autoload
 (def-setting! :devdocs (modes docset)
   "Map major MODES (one major-mode symbol or a list of them) to a devdocs

modules/feature/lookup/autoload/docsets.el

@@ -30,6 +30,7 @@ Used by `+lookup/in-docsets' and `+lookup/documentation'."
                                     docsets)))))
              (add-hook hook fn))))))
 
+;; FIXME obsolete :docset
 ;;;###autoload
 (def-setting! :docset (modes &rest docsets)
   "Registers a list of DOCSETS (strings) for MODES (either one major mode

modules/feature/lookup/autoload/lookup.el

@@ -56,6 +56,7 @@ properties:
                            (add-hook 'xref-backend-functions xref-backend nil t))))))
              (add-hook hook fn))))))
 
+;; FIXME obsolete :lookup
 ;;;###autoload
 (def-setting! :lookup (modes &rest plist)
   :obsolete set-lookup-handlers!