Update file buyer-persona.md | Fixed Broken Images in Comparison Personas

Why is this change being made?

💡 Provide a detailed answer to the question on why this change is being proposed, in accordance with our value of Transparency.

The comparison images appear to be broken on this page: https://handbook.gitlab.com/handbook/marketing/brand-and-product-marketing/product-and-solution-marketing/roles-personas/buyer-persona/#comparing-the-personas. While debugging, I discovered the issue was due to a broken link. I have updated the page with the correct image link.

CHANGEME

Author and Reviewer Checklist

Please verify the check list and ensure to tick them off before the MR is merged.

• Provided a concise title for this Merge Request (MR)
• Added a description to this MR explaining the reasons for the proposed change, per say why, not just what
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• Assign reviewers for this MR to the correct Directly Responsible Individual/s (DRI)
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  • The when to get approval handbook section explains the workflow in more detail
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Commits

• Update file buyer-persona.md

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