How to remove Wordpress Welcome Message from every new blog dashboard

In every blog I create in my Wordpress Network I got this message on each dashboard:

Welcome to your new WordPress site!

If you need help getting started, check out our documentation on First Steps with WordPress. If you’d rather dive right in, here are a few things most people do first when they set up a new WordPress site. If you need help, use the Help tabs in the upper right corner to get information on how to use your current screen and where to go for more assistance.

Clean Up The Dashboard Can't remove this? which plugin does?