bug#37703: 26.3; Doc string of `describe-key'

[Eli Zaretskii]

> Date: Fri, 11 Oct 2019 08:21:49 -0700 (PDT)
> From: Drew Adams <drew.adams@oracle.com>
> 
> Now that we have cleverly removed showing both up and down mouse-button
> events by default, please mention in the doc string of `describe-key'
> this for a mouse click:
> 
> If you want to see help for both up- and down-button events for a
> mouse-button click then you need to hold the button pressed down for a
> bit, before releasing it. Otherwise you see only help for the up-button
> event.

In Emacs 27, there's no need to hold the mouse button, so this bug is
already solved, and I'm closing this report.