Replace "Chapter 2" to reference to viewing-history.asc

Author: satob

book/08-customizing-git/sections/policy.asc

@@ -167,7 +167,7 @@ On the ACL file you looked at earlier, this `get_acl_access_data` method returns
 
 Now that you have the permissions sorted out, you need to determine what paths the commits being pushed have modified, so you can make sure the user who's pushing has access to all of them.
 
-You can pretty easily see what files have been modified in a single commit with the `--name-only` option to the `git log` command (mentioned briefly in Chapter 2):
+You can pretty easily see what files have been modified in a single commit with the `--name-only` option to the `git log` command (mentioned briefly in <<_viewing_history>>):
 
 [source,console]
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