Fix typo in balloon help

Fix launchpad #563883

Signed-off-by: Riccardo Magliocchetti <[email protected]>
Signed-off-by: Aurelien Jarno <[email protected]>
diff --git a/qemu-monitor.hx b/qemu-monitor.hx
index e30b250..f4f88df 100644
--- a/qemu-monitor.hx
+++ b/qemu-monitor.hx
@@ -987,7 +987,7 @@
         .name       = "balloon",
         .args_type  = "value:M",
         .params     = "target",
-        .help       = "request VM to change it's memory allocation (in MB)",
+        .help       = "request VM to change its memory allocation (in MB)",
         .user_print = monitor_user_noop,
         .mhandler.cmd_async = do_balloon,
         .async      = 1,