bug#35433: 27.0.50; 'function' docstring: tell more about advantages?

[Eli Zaretskii]

> From: Michael Heerdegen <michael_heerdegen@web.de>
> Cc: 35433@debbugs.gnu.org
> Date: Thu, 23 May 2019 01:39:49 +0200
> 
> +When @var{function-object} is a symbol and the code is byte compiled,
> +the byte-compiler will warn should that function be undefined or may
> +be unknown at run-time.

I'd say "... will warn if that function is not defined, which means
it might not be known at run time" instead.  "Undefined" and "unknown"
sound vague and more ominous to me.

Otherwise, fine with me, thanks.