Option 1: A new documentation space
Use this option if...
you are starting a new documentation space, or
you have an existing space you will use as the draft, and will publish to a new space
Before choosing Publish you can
View Changes that are pending in each of the draft and the published spaces
Option 2: Adding to a populated space
Use this option if...
you have an existing space, on which people have comments, watched pages, etc
ANDyou need a draft space to which you can make changes, and when approved, will publish to your existing space