qemu-io-cmds: Fixed typo in example for writev.

Signed-off-by: Maria Kustova <maria.k@catit.be>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
diff --git a/qemu-io-cmds.c b/qemu-io-cmds.c
index fb1db53..60c1ceb 100644
--- a/qemu-io-cmds.c
+++ b/qemu-io-cmds.c
@@ -1087,7 +1087,7 @@
 " writes a range of bytes from the given offset source from multiple buffers\n"
 "\n"
 " Example:\n"
-" 'write 512 1k 1k' - writes 2 kilobytes at 512 bytes into the open file\n"
+" 'writev 512 1k 1k' - writes 2 kilobytes at 512 bytes into the open file\n"
 "\n"
 " Writes into a segment of the currently open file, using a buffer\n"
 " filled with a set pattern (0xcdcdcdcd).\n"