Branching: Add a note about "git checkout -b" (#1182)

Branching: Add a note about "git checkout -b"

Author: ben

book/03-git-branching/sections/nutshell.asc

@@ -180,3 +180,9 @@ Also, because we're recording the parents when we commit, finding a proper merge
 These features help encourage developers to create and use branches often.
 
 Let's see why you should do so.
+
+[NOTE]
+.Creating a new branch and switching to it at the same time
+====
+It's typical to create a new branch and want to switch to that new branch at the same time -- this can be done in one operation with `git checkout -b <newbranchname>`.
+====