update the documentation for the g3bw -> g3beige change

Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6229 c046a42c-6fe2-441c-8c8c-71466251a162

qemu-doc.texi

@@ -2332,7 +2332,7 @@ QEMU uses the Open Hack'Ware Open Firmware Compatible BIOS available at
 @url{http://perso.magic.fr/l_indien/OpenHackWare/index.htm}.
 
 Since version 0.9.1, QEMU uses OpenBIOS @url{http://www.openbios.org/}
-for the g3bw PowerMac machine. OpenBIOS is a free (GPL v2) portable
+for the g3beige PowerMac machine. OpenBIOS is a free (GPL v2) portable
 firmware implementation. The goal is to implement a 100% IEEE
 1275-1994 (referred to as Open Firmware) compliant firmware.