bug#30349: 27.0.50; Cuonfusing documentation about pipe processes

[Eli Zaretskii]

> From: Philipp <p.stephani2@gmail.com>
> Date: Sun, 04 Feb 2018 17:29:30 +0100
> 
> The manual says about pipe processes:
> 
> @item :stop @var{stopped}
> If @var{stopped} is non-@code{nil}, start the process in the
> stopped state.
> 
> => What does "the stopped state" mean?  How can a pipe be "stopped"?

See stop-process and continue-process.