patch to gdb documentation

[Stan Shebs]

   Date: Thu, 3 Dec 1998 12:19:11 -0800 (PST)
   From: "J.T. Conklin" <jtc@redbacknetworks.com>

   The enclosed patch changes the wording that explains that GDB now
   implements a write-through cache for register values.  Previously
   it stated that the protocol itself implements the cache, which is
   obviously not true.

Good call, thanks.  I've committed the change to the repository. -s