chore(docs): clean up a few md errors

UPDATING.md

@@ -116,7 +116,7 @@ assists people when migrating to a new version.
 - [24911](https://github.com/apache/superset/pull/24911): Changes the column type from `TEXT` to `MediumText` in table `logs`, potentially requiring a table lock on MySQL dbs or taking some time to complete on large deployments.
 - [24939](https://github.com/apache/superset/pull/24939): Augments the foreign key constraints for the `embedded_dashboards` table to include an explicit CASCADE ON DELETE to ensure the relevant records are deleted when a dashboard is deleted. Scheduled downtime may be advised.
 - [24938](https://github.com/apache/superset/pull/24938): Augments the foreign key constraints for the `dashboard_slices` table to include an explicit CASCADE ON DELETE to ensure the relevant records are deleted when a dashboard or slice is deleted. Scheduled downtime may be advised.
-- [24628]https://github.com/apache/superset/pull/24628): Augments the foreign key constraints for the `dashboard_owner`, `report_schedule_owner`, and `slice_owner` tables to include an explicit CASCADE ON DELETE to ensure the relevant ownership records are deleted when a dataset is deleted. Scheduled downtime may be advised.
+- [24628](https://github.com/apache/superset/pull/24628): Augments the foreign key constraints for the `dashboard_owner`, `report_schedule_owner`, and `slice_owner` tables to include an explicit CASCADE ON DELETE to ensure the relevant ownership records are deleted when a dataset is deleted. Scheduled downtime may be advised.
 - [24488](https://github.com/apache/superset/pull/24488): Augments the foreign key constraints for the `sql_metrics`, `sqlatable_user`, and `table_columns` tables which reference the `tables` table to include an explicit CASCADE ON DELETE to ensure the relevant records are deleted when a dataset is deleted. Scheduled downtime may be advised.
 - [24232](https://github.com/apache/superset/pull/24232): Enables ENABLE_TEMPLATE_REMOVE_FILTERS, DRILL_TO_DETAIL, DASHBOARD_CROSS_FILTERS by default, marks VERSIONED_EXPORT and ENABLE_TEMPLATE_REMOVE_FILTERS as deprecated.
 - [23652](https://github.com/apache/superset/pull/23652): Enables GENERIC_CHART_AXES feature flag by default.
@@ -132,7 +132,7 @@ assists people when migrating to a new version.
 
 ### Breaking Changes
 
-- [24686]https://github.com/apache/superset/pull/24686): All dataset's custom explore_url are handled as relative URLs on the frontend, behaviour controlled by PREVENT_UNSAFE_DEFAULT_URLS_ON_DATASET.
+- [24686](https://github.com/apache/superset/pull/24686): All dataset's custom explore_url are handled as relative URLs on the frontend, behaviour controlled by PREVENT_UNSAFE_DEFAULT_URLS_ON_DATASET.
 - [24262](https://github.com/apache/superset/pull/24262): Enabled `TALISMAN_ENABLED` flag by default and provided stricter default Content Security Policy
 - [24415](https://github.com/apache/superset/pull/24415): Removed the obsolete Druid NoSQL REGEX operator.
 - [24423](https://github.com/apache/superset/pull/24423): Removed deprecated APIs `/superset/slice_json/...`, `/superset/annotation_json/...`
@@ -317,8 +317,7 @@ html#step-1-adjust-your-command-line-invocation) instructions for adjustments. A
 ### Potential Downtime
 
 - [14234](https://github.com/apache/superset/pull/14234): Adds the `limiting_factor` column to the `query` table. Give the migration includes a DDL operation on a heavily trafficked table, potential service downtime may be required.
-
--[16454](https://github.com/apache/superset/pull/16454): Adds the `extra` column to the `table_columns` table. Users using MySQL will either need to schedule downtime or use the percona toolkit (or similar) to perform the migration.
+- [16454](https://github.com/apache/superset/pull/16454): Adds the `extra` column to the `table_columns` table. Users using MySQL will either need to schedule downtime or use the percona toolkit (or similar) to perform the migration.
 
 ## 1.2.0