Fix primary identifier mismatch image

What does this MR do and why?

This MR updates the primary identifier mismatch image in section Importance of the primary identifierto be rendered inline instead of a link to an image.

This update makes easier to see the example image.

Screenshots or screen recordings

Before

After

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.