Add autoloads

helpful.el

@@ -541,20 +541,23 @@ For example, \"(some-func FOO &optional BAR)\"."
                              (symbol-name sym-here))))))
 
 ;; TODO: it would be nice to support variables too.
+;;;###autoload
 (defun helpful-function (symbol)
   "Show help for function named SYMBOL."
   (interactive
    (list (helpful--read-symbol "Function:" #'functionp)))
   (switch-to-buffer (helpful--buffer symbol))
   (helpful-update))
 
+;;;###autoload
 (defun helpful-command (symbol)
   "Show help for interactive function named SYMBOL."
   (interactive
    (list (helpful--read-symbol "Command:" #'commandp)))
   (switch-to-buffer (helpful--buffer symbol))
   (helpful-update))
 
+;;;###autoload
 (defun helpful-macro (symbol)
   "Show help for macro named SYMBOL."
   (interactive