fix(emacs-lisp): always try Helpful for doc lookup

As per the description in 6671adc68, this module should always use
Helpful's functions as long as Helpful is available (ie. not explicitly
disabled by the user in packages.el). The remapping of `describe-symbol`
is irrelevant here - the user might prefer to rebind `C-h C-o` to
`describe-symbol` (as `helpful-symbol` cannot look up types), but that
doesn't necessarily mean they want this module not to use it.

modules/lang/emacs-lisp/autoload.el

@@ -117,7 +117,8 @@ if it's callable, `apropos' otherwise."
                  (org-show-hidden-entry))))
            'deferred))
         (thing
-         (funcall (or (command-remapping #'describe-symbol)
+         (funcall (if (fboundp #'helpful-symbol)
+                      #'helpful-symbol
                     #'describe-symbol)
                   (intern thing)))
         ((call-interactively