update 4B,4D,5B and add 6B release notes and toc update

[TaraOverfield]

Summary

Describe your changes here.

Fixes #Issue_Number (if available)

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Internal previews

📄 File	🔗 Preview link
docs/framework/release-notes/2024/04-09-april-security-and-quality-rollup.md	April 2024 security and quality rollup
docs/framework/release-notes/2024/04-23-april-preview-cumulative-update.md	April 2024 cumulative update preview
docs/framework/release-notes/2024/05-14-may-security-and-quality-rollup.md	May 2024 security and quality rollup
docs/framework/release-notes/2024/06-25-june-preview-cumulative-update.md	docs/framework/release-notes/2024/06-25-june-preview-cumulative-update