fix(cli): doom {compile,clean} errors

- An improper autoload was preventing 'doom clean' from being
  recognized.
- 'doom compile' hadn't been updated to reflect changes introduced
  recently in 1402db5.

Amend: 6c0b7e1530
Ref: 1402db5129

bin/doom

@@ -257,6 +257,7 @@ SEE ALSO:
       (defautoload! ((build b purge p rollback)) "packages")
       (defautoload! ((install i)))
       (defautoload! ((compile c)))
+      (defautoload! (clean) "compile")
 
       ;; TODO Post-3.0 commands
       ;; (load! "gc" dir)