docs/144516: Remove obsolete sections from handbook

[joeb]

The following reply was made to PR docs/144516; it has been noted by GNATS.

From: "joeb" <joeb at a1poweruser.com>
To: <bug-followup at FreeBSD.org>,
	<aiza21 at comclark.com>
Cc:  
Subject: Re: docs/144516: Remove obsolete sections from handbook
Date: Tue, 9 Mar 2010 15:14:26 +0800

 See pr 
 http://www.freebsd.org/cgi/query-pr.cgi?pr=144517
 
 
 The kernel SLIP and PPP drivers and associated utilities were removed from 
 the base system in April 2009 in r190751.
 
 So now no reason to keep those 2 sections in the handbook.