dot gitignore: add qemu-monitor.texi

add qemu-monitor.texi to .gitignore.
Signed-off-by: NIsaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

.gitignore

@@ -22,6 +22,7 @@ qemu-options.texi
 qemu-img-cmds.texi
 qemu-img-cmds.h
 qemu-io
+qemu-monitor.texi
 .gdbinit
 *.a
 *.aux