Update external-projects Business owner.md

[kfklein15]

What does this change?

Module: Final Projects Week(s): External projects

Checklist

• [ ] I have read the contributing guidelines
• [ ] I have checked my spelling and grammar with an automated tool
• [ ] I have previewed my changes to check the markdown renders as I intend
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• [ ] My changes follow our Style Guide

Description

Changing PO to Business Owner, to avoid confusion. Review some grammar. Updated the link to the CYF Docs correct page. ## Who needs to know about this?

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