Update syntax highlighting branch name

Co-authored-by: Jacob Sommer <[email protected]>

pages/peterportal/getting-started.mdx

@@ -53,7 +53,7 @@ This document will guide you through setting up the project on your local machin
 Before starting your work, switch to a new branch with a relevant name to your task:
 
 ```bash
-git checkout -b [branch name]
+git checkout -b [branch-name]
 ```
 
 </Steps>