* Revert "Refactor `highlight` tag to behave like the `raw` tag (#6821)"
This reverts commit 36404b9a43.
* use Liquid `raw` in upgrading document
* let the minor improvements stay
* Revert entry in History.markdown
Revert "Add missing divider in upgrading-guide"
This reverts commit d8c745ca30.
Revert "Update history to reflect merge of #7521"
This reverts commit 7ee2e26d6c.
Revert "Upgrade WinTZ utility to use TZInfo-2.0"
This reverts commit 13cbef4221.
Lock use of `tzinfo` gem to v1.x