Review of the Silverstripe CMS 5.2.0 changelog

[GuySartorelli]

Description

Review of the Silverstripe CMS 5.2.0 changelog.

Commits

1. Update note about linkfield migration guides
2. add new items to changelog
3. overall review of content (writing style and readability)

New items added to the changelog

I found these in the commits list from the beta changelog. If you disagree with any of these being in the changelog let me know, there's only a couple here that I'm really adamant on and the rest I could take or leave.

• https://github.com/silverstripe/silverstripe-framework/pull/11119
• https://github.com/silverstripe/silverstripe-admin/pull/1678
• https://github.com/silverstripe/silverstripe-admin/pull/1658 maybe?
• https://github.com/silverstripe/silverstripe-staticpublishqueue/pull/178
• deprecations in https://github.com/silverstripe/silverstripe-framework/pull/11049

Issues

• https://github.com/silverstripe/developer-docs/issues/472

Pull request checklist

• [x] The target branch is correct
  • See branches and commit messages
• [x] All commits are relevant to the purpose of the PR (e.g. no TODO comments, unrelated rewording/restructuring, or arbitrary changes)
  • Small amounts of additional changes are usually okay, but if it makes it hard to concentrate on the relevant changes, ask for the unrelated changes to be reverted, and submitted as a separate PR.
• [x] The commit messages follow our commit message guidelines
• [x] The PR follows our contribution guidelines
• [x] The changes follow our writing style guide
• [x] Code examples follow our coding conventions
• [ ] CI is green