Fix typo in usage of install-openmano.sh

Change-Id: I7f6566f6b73254102d7a3bd79716c7b3d4d8dcc3
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/scripts/install-openmano.sh b/scripts/install-openmano.sh
index 36f59d4..a198148 100755
--- a/scripts/install-openmano.sh
+++ b/scripts/install-openmano.sh
@@ -39,7 +39,7 @@
     echo -e "     --force:    makes idenpotent, delete previous installations folders if needed"
     echo -e "     --noclone:  assumes that openmano was cloned previously and that this script is run from the local repo"
     echo -e "     --no-install-packages: use this option to skip updating and installing the requires packages. This avoid wasting time if you are sure requires packages are present e.g. because of a previous installation"
-    echo -e "     --no-db: do not insall mysql server"
+    echo -e "     --no-db: do not install mysql server"
 }
 
 function install_packages(){