bug#25960: minor gotcha in tutorial

[liam]

> But the pending is gone, right?  AFAIK, that's how it's supposed

> to work.

I don't think it's the same.   Try C-u follow by C-g.  You'll see 'Quit' in the status and no alert noise.  There are plenty of undefined key sequences and keying them doesn't mean the sequence was cancelled.  Anyway, it's so minor it really doesn't matter but as it's in the tutorial I thought I'd mention it.