Edit v6.13.0 Diffraction Release Notes

[cailafinn]

Description of work

Summary of work

Diffraction release notes for v6.13.0.

Refs #39471

To test:

Formatting and no build warnings.

1. cmake --build . --target docs-html
2. open docs/html/release/v6.13.0/diffraction.html

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Reviewer

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• Does the code conform to the coding standards?
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[sf1919]

There are a few changes I'm requesting that be made. Otherwise formatting, spelling and grammer are all good.

I see that some PRs have links to the GitHub issues relating to them. Either we need to do that with all release notes or we need to remove the links from these ones. I would prefer consistency.

[sf1919]

Thank you so much for the changes I requested. I think it looks much better.