Add [source,ini] to inline .git/config snippets

Author: crd

book/06-github/sections/3-maintaining.asc

@@ -170,6 +170,7 @@ There's also a way to fetch _all_ of the pull requests, and keep them up to date
 Open up `.git/config` in your favorite editor, and look for the `origin` remote.
 It should look a bit like this:
 
+[source,ini]
 ----
 [remote "origin"]
     url = https://github.com/libgit2/libgit2
@@ -181,6 +182,7 @@ It's a way of mapping names on the remote with names in your local `.git` direct
 This particular one tells Git, "the things on the remote that are under `refs/heads` should go in my local repository under `refs/remotes/origin`."
 You can modify this section to add another refspec:
 
+[source,ini]
 ----
 [remote "origin"]
     url = https://github.com/libgit2/libgit2.git