add June 2022 release notes

[raynamharris]

PR Description

Adds release notes for June release.

Feedback Requested

Please check spelling, links, and confirm that all necessary updates have been mentioned (see pre-release at https://github.com/nih-cfde/training-and-engagement/releases)

Reviewer Checklist

• [ ] spelling and grammar
• [ ] functional links
• [ ] all updates mentioned

PR Preview

https://cfde-training-and-engagement--548.com.readthedocs.build/en/548/

PR Checklist

• [x] Release label added
• [x] Category label added
• [x] Clean build logs
• [x] Linked related issues #532
• [x] Ready for review
• [ ] Ready to merge

[raynamharris]

Ready for review. Main addition is the release notes. See https://cfde-training-and-engagement--548.com.readthedocs.build/en/548/Release-Notes/