bug#33191: 26.1.50; remove remaining process input batching doc

[Eli Zaretskii]

> Date: Sun, 09 Dec 2018 17:15:49 +0100
> From: charles@aurox.ch (Charles A. Roelli)
> CC: 33191@debbugs.gnu.org
> 
> > Date: Sun, 09 Dec 2018 14:47:54 +0200
> > From: Eli Zaretskii <eliz@gnu.org>
> >
> > Thanks, but this removes too much, IMO.  The 500 bytes figure should
> > go away, but we still send the string in chunks, albeit
> > system-dependent ones, and we still allow output from processes to
> > arrive between chunks.
> 
> True, but it seems like chunked sending is broken somehow: Bug#6149
> (GNU/Linux) and Bug#32438 (macOS) both show this.

The former is supposed to be solved.

> (There may be similar problems on MS Windows; I have not tested.)
> If we say that sending is done in chunks, users might infer that
> there are no such problems.

I don't see how such a conclusion could follow.  IMO, it's important
to tell that we send large strings in smaller chunks, because
otherwise some phenomena might come as a surprise.

> Maybe we can add that system-dependent problems may occur for input
> longer than 1 kB.

I don't think we should document bugs.  We should solve them instead.