obmc-shutdown: Fix 'unounted' typo

Change-Id: I694b464e472fc1e890705a96c6fd85c636c7e720
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
diff --git a/common/recipes-phosphor/initfs/files/obmc-shutdown.sh b/common/recipes-phosphor/initfs/files/obmc-shutdown.sh
index 8d5c672..beebb6c 100644
--- a/common/recipes-phosphor/initfs/files/obmc-shutdown.sh
+++ b/common/recipes-phosphor/initfs/files/obmc-shutdown.sh
@@ -77,7 +77,7 @@
 fi
 
 
-echo "Execute ${1-reboot} -f if all unounted ok, or exec /init"
+echo "Execute ${1-reboot} -f if all unmounted ok, or exec /init"
 
 export PS1=shutdown-sh#\ 
 exec /bin/sh