bug#21728: 25.0.50; [patch] mention focus-{in,out}-hook in manual

[Eli Zaretskii]

> From: Aaron Ecay <aaronecay@gmail.com>
> Date: Wed, 21 Oct 2015 19:48:06 +0100
> 
> The emacs lisp reference doesn’t mention focus-in-hook and its -out-
> variant, except in a list of hooks.

No, they are also mentioned in the node "Input Focus".  And the node
"Focus Events", where you suggested the addition, has a
cross-reference to "Input Focus", near its beginning.  So perhaps what
we need is a sentence near that cross-reference that somehow mentions
these two hooks, and all the rest is already in place?  Would you like
to suggest an alternative patch along these lines?

Thanks.