Quick fix for TOC & release notes

[internetisaiah]

Summary

Fixing a couple TOC issues, adding the 4.5 release notes, and adding release notes templates to contributing docs.

Related PRs, issues, or features (optional)

• N/A

Metadata

• [ ] Adds new file(s)
• [x] Edits existing file(s)
• [ ] Removes file(s)

PR contributor checklist

• [x] My PR follows the Kobiton Docs contributor guidelines, meaning:

  • My content contains correct spelling and grammar.
  • My files are named and structured correctly.
  • My style and voice follows the Microsoft Style Guide.
  • I added all new pages to their section's nav.adoc file.
  • I removed all localizations (like en-us) from my URLs.