improve step 5

You can fill the title field with whatever you like. It's not necessary to mention this in the Readme like "First group", because we don't refer to it in a later step of the documentation. There's also no need for your first group to be called First group, it just says it in the docs so you have a starting point.

I guess this might be a little confusing and could be reworded.

Here's a quick patch providing a quick explanation above the installation guide. It also fixes a couple of mistakes I found.

Moving to OG prject, as OG will be the name in D7.

Committed with minor changes. Thanks!