Welcome screen: update credits for 2.1.

git-svn-id: https://buddypress.svn.wordpress.org/trunk@9013 cdf35c40-ae34-48e0-9cc9-0c9da1808c22
Welcome screen: remove "go to the settings screen" text link from the bottom of the credits screen.

This doesn't add much value and kind of spoils the bottom of the credits screen, albeit only for site admins.

git-svn-id: https://buddypress.svn.wordpress.org/trunk@9014 cdf35c40-ae34-48e0-9cc9-0c9da1808c22