[PATCH 4/6] command 'set debug notification'.

[Eli Zaretskii]

> From: Yao Qi <yao@codesourcery.com>
> Date: Mon, 24 Sep 2012 09:38:41 +0800
> 
> This patch adds a new command 'set debug notification', and documents
> this new command.

OK for the documentation part.  Thanks.