Handbook update: HorizSync and VertRefresh

[Benjamin Kaduk]

On Mon, 2 Jul 2012, Warren Block wrote:

> The X11 configuration chapter of the Handbook has some very old
> information which is confusing users.  Manually setting HorizSync and
> VertRefresh has been mostly useless for many years, and should be
> deemphasized.
>
> This patch does that.  Instead of saying the sync frequencies must
> always be entered, it adds some information about autodetection and
> points out that almost all monitors support it.  Also added is a note
> not to guess about sync frequencies.  On the CRT monitors where it
> matters, it can matter a lot.  Some of those monitors might still be
> functional.

One does hear the occasional tale of a CRT which exploded when the wrong 
frequencies were configured ... it might be worth mentioning that guessing 
values could lead to hardware damage.

>
> Feedback welcome.  If there aren't any loud screams of outrage, squawks
> of offense, or mere bacaws of disgust, I'll commit it in a couple of
> days.

It seems basically reasonable.

-Ben