I know 10% growth is a bad setting. That's why I said "Later you can go about tweaking them individually." The point is just to show you can run something in all databases to get rid of the 1 MB growth setting. If you wanted to change the script to make the growth a hard amount, that's your business, but I am assuming you would want to grow each databases based on various factors, including your personal knowledge of how the databases is used -- not something I could include easily in this script.

I am not necessarily advocating leaving the databases at 10% growth.