Small documentation fix

[Ori Avtalion]

The system context node also contains hostid. It's missing in the parent node.
Patch below.

Index: coreutils/doc/coreutils.texi
===================================================================
RCS file: /sources/coreutils/coreutils/doc/coreutils.texi,v
retrieving revision 1.320
diff -u -r1.320 coreutils.texi
--- coreutils/doc/coreutils.texi        28 Mar 2006 09:48:15 -0000      1.320
+++ coreutils/doc/coreutils.texi        8 Apr 2006 18:59:37 -0000
@@ -188,7 +188,7 @@
* File name manipulation::             dirname basename pathchk
* Working context::                    pwd stty printenv tty
* User information::                   id logname whoami groups users who
-* System context::                     date uname hostname
+* System context::                     date uname hostname hostid
* Modified command invocation::        chroot env nice nohup su
* Process control::                    kill
* Delaying::                           sleep