[RFA] Fix documentation of snprintf and vsnprintf

[Eli Zaretskii]

> Date: Fri, 29 May 2009 16:45:32 -0400
> From: DJ Delorie <dj@redhat.com>
> CC: gcc-patches@gcc.gnu.org, gdb-patches@sourceware.org
> 
> 
> Ok.  Decide on the final wording/patch and email it to me, and I'll
> apply it.

Please apply the modified version I sent at 23:59:08 +0300.

Thanks.