Number consistency

Replaced 'it' with 'them' because it refers to 'workflows' which is in plural.

Author: eyherabh

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

@@ -1,7 +1,7 @@
 === Branching Workflows
 
 Now that you have the basics of branching and merging down, what can or should you do with them?
-In this section, we'll cover some common workflows that this lightweight branching makes possible, so you can decide if you would like to incorporate it into your own development cycle.
+In this section, we'll cover some common workflows that this lightweight branching makes possible, so you can decide if you would like to incorporate them into your own development cycle.
 
 ==== Long-Running Branches