[2.x] Update release notes

[emmadesilva]

No description provided.

[Copilot]

Pull Request Overview

This PR updates the release notes documentation to improve clarity and user experience by restructuring upgrade-related content and fixing resource links.

• Reorganized upgrade information with clearer section headings and simplified content
• Removed the detailed migration checklist and prerequisites section
• Updated navigation label and resource links to reflect current URLs

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
docs/getting-started/release-notes.md	Updated navigation label, restructured upgrade sections, and corrected GitHub/Discord URLs
RELEASE_NOTES.md	Applied same structural changes and Discord URL update as the documentation file

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (c793bfc) to head (3c41645).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##              master     #2318   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity      2000      2000           
===========================================
  Files            197       197           
  Lines           5178      5178           
===========================================
  Hits            5178      5178           

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