Fix alignment of commit changes block

What does this MR do and why?

Fixes alignment of commit changes block

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How to set up and validate locally

Look at a commit

• tightened up vertical spacing above file, removes double border
• fixes bottom border radius

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.

#394879 (closed)