Fix typo

Author: harupong

book/06-github/1-github.asc

@@ -30,5 +30,5 @@ include::sections/5-scripting.asc[]
 === Summary
 
 Now you're a GitHub user.
-You know how to create an account, manage an organization, create and push to repositories, contribute to other peoples projects and accept contributions from others.
+You know how to create an account, manage an organization, create and push to repositories, contribute to other people's projects and accept contributions from others.
 In the next chapter, you'll learn more powerful tools and tips for dealing with complex situations, which will truly make you a Git master.