Update README.md

Co-authored-by: Taylor Blau <[email protected]>

Author: dscho

README.md

@@ -10,11 +10,10 @@ This site is built with [Hugo](https://gohugo.io/) and served via GitHub Pages.
 
 It is highly recommended to clone this repository using [`scalar`](https://git-scm.com/docs/scalar); This allows to work only on the parts of the repository relevant to your interests. You can select which directories are checked out using the [`git sparse-checkout add <directory>...`](https://git-scm.com/docs/git-sparse-checkout) command. Typically, you will want to start like this:
 
-```
-scalar clone http://github.com/git/git-scm.com
-cd git-scm.com/src
-git sparse-checkout set layouts content static assets hugo.yml data script
-```
+```ShellSession
+$ scalar clone http://github.com/git/git-scm.com
+$ cd git-scm.com/src
+$ git sparse-checkout set layouts content static assets hugo.yml data script
 
 Here is a detailed list of the relevant directories: