bug#24738: corrections to steps to repro

[Gemini Lasswell]

I left out a couple of steps, so please use this sequence to reproduce
the bug:

1. emacs -Q
2. M-: (require 'seq) RET
3. enter the following code into *scratch*:

(defun seq-let-bug ()
  (let ((nums [1 2 3 4 5]))
    (seq-let (a b c) nums
      (message "a=%s b=%s c=%s" a b c))))

4. C-u C-M-x 
5. M-: (seq-let-bug) RET
6. G

After step 5 the debugger prompt will appear, so the G is to make it
continue execution without stopping.