is comprehensive.
No doubt the user interface and documentation will improve, and new
-features will will be added. But you can start using it right away.
+features will will be added. Indeed you'll see we're referring you to
+the version of the tutorial manpage from sid: that's because we've
+just done some documentation updates. But you can start using
+git-debrebase from stretch-backports, testing, or unstable, right
+away.
The best starting point is probably the tutorial manpage
dgit-maint-debrebase (which is in the dgit package).