add diff in code block

[dks333]

Documentation changes

Add Diff section in CodeBlock components

https://mintlify-sam-add-diff-in-code-block.mintlify.app/code#diff

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For Reviewers

When reviewing documentation PRs, please consider:

✅ Technical accuracy

• Code examples work as written
• Commands and configurations are correct
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✅ Clarity and completeness

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✅ User experience

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[ethanpalm]

One small nit to make the instructions a bit more concise. Looks good to me!