bug#26626: 24.5; doc of `last-command-event' and `last-nonmenu-event'

[Drew Adams]

> > There's no such thing as a "command key sequence",
> > as opposed, one imagines, to a "non-command key
> > sequence".  A key sequence that is complete is
> > always bound to a command.
> 
> Not true.  Everything that isn't a prefix key is a complete key, bound
> or not.

Right.  I misspoke.  I didn't mean that only bound
key sequences are complete key sequences.

The point is that there's no such thing as a "command"
key sequence", just as there's no such thing as a
non-command key sequence.  Key sequences can be bound
only to commands - not to anything else.  Commands
can be bound to key sequences - not to anything else.