[TASK] Update when to where in walkthrough docs (#1660)

## Description

Just a small doc correction. Closes #1658 

## Related Issue

Fixes #1658 
<!-- or -->
Relates to #1658

## Type of change

- [x] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Other (security config, docs update, etc)

## Checklist before merging

- [x] Test, docs, adr added or updated as needed
- [x] [Contributor Guide
Steps](https://github.com/defenseunicorns/zarf/blob/main/CONTRIBUTING.md#developer-workflow)
followed

Signed-off-by: Casey Wylie <[email protected]>

docs/13-walkthroughs/3-deploy-a-retro-arcade.md

@@ -17,7 +17,7 @@ In previous walkthroughs, we learned how to [create a package](./0-using-zarf-pa
 ## YouTube Walkthrough
 [![Deploying Packages with Zarf Video on YouTube](../.images/walkthroughs/package_deploy_thumbnail.jpg)](https://youtu.be/7hDK4ew_bTo "Deploying Packages with Zarf")
 
-1. Navigate to the `dos-games` folder within the Zarf repo.
+1. Navigate to the folder where you created the package in a previous walkthrough. (see [prerequisites](#prerequisites))
 
 ```sh
 $ cd src/github.com/defenseunicorns/zarf/examples/dos-games