docs: Remove unnecessary line item (apache#20657)

UPDATING.md

@@ -35,7 +35,6 @@ assists people when migrating to a new version.
 - [19046](https://github.com/apache/superset/pull/19046): Enables the drag and drop interface in Explore control panel by default. Flips `ENABLE_EXPLORE_DRAG_AND_DROP` and `ENABLE_DND_WITH_CLICK_UX` feature flags to `True`.
 - [18936](https://github.com/apache/superset/pull/18936): Removes legacy SIP-15 interim logic/flags—specifically the `SIP_15_ENABLED`, `SIP_15_GRACE_PERIOD_END`, `SIP_15_DEFAULT_TIME_RANGE_ENDPOINTS`, and `SIP_15_TOAST_MESSAGE` flags. Time range endpoints are no longer configurable and strictly adhere to the `[start, end)` paradigm, i.e., inclusive of the start and exclusive of the end. Additionally this change removes the now obsolete `time_range_endpoints` from the form-data and resulting in the cache being busted.
 - [19570](https://github.com/apache/superset/pull/19570): makes [sqloxide](https://pypi.org/project/sqloxide/) optional so the SIP-68 migration can be run on aarch64. If the migration is taking too long installing sqloxide manually should improve the performance.
-- [20170](https://github.com/apache/superset/pull/20170): Introduced a new endpoint for getting datasets samples.
 - [20606](https://github.com/apache/superset/pull/20606): When user clicks on chart title or "Edit chart" button in Dashboard page, Explore opens in the same tab. Clicking while holding cmd/ctrl opens Explore in a new tab. To bring back the old behaviour (always opening Explore in a new tab), flip feature flag `DASHBOARD_EDIT_CHART_IN_NEW_TAB` to `True`.
 
 ### Breaking Changes