Move E721 change to preview section (#8170)

CHANGELOG.md

@@ -18,11 +18,11 @@ Try it today with `ruff format`.
 - Add fix for `E273` and `E274` ([#8144](https://github.com/astral-sh/ruff/pull/8144))
 - Add fix for `E275` ([#8133](https://github.com/astral-sh/ruff/pull/8133))
 - Update `SIM401` to catch ternary operations ([#7415](https://github.com/astral-sh/ruff/pull/7415))
+- Update `E721` to allow `is` and `is` not for direct type comparisons ([#7905](https://github.com/astral-sh/ruff/pull/7905))
 
 ### Rule changes
 
 - Add `backports.strenum` to `deprecated-imports` ([#8113](https://github.com/astral-sh/ruff/pull/8113))
-- Update `E721` to allow `is` and `is` not for direct type comparisons ([#7905](https://github.com/astral-sh/ruff/pull/7905))
 - Update `SIM112` to ignore `https_proxy`, `http_proxy`, and `no_proxy` ([#8140](https://github.com/astral-sh/ruff/pull/8140))
 - Update fix for `literal-membership` (`PLR6201`) to be unsafe ([#8097](https://github.com/astral-sh/ruff/pull/8097))
 - Update fix for  `mutable-argument-defaults` (`B006`) to be unsafe ([#8108](https://github.com/astral-sh/ruff/pull/8108))