fix headings

Author: taroface

src/current/_includes/releases/v25.4/v25.4.0.md

@@ -274,25 +274,25 @@ Before you upgrade, review these changes and other information about the new maj
 
 This section describes newly identified limitations in CockroachDB v25.4.
 
-### Views
+##### Views
 
 - The `security_invoker` attribute for views is not supported. Views always use the view definer's privileges when checking permissions. [#138918](https://github.com/cockroachdb/cockroach/issues/138918)
 - Casting subqueries to [user-defined types]({% link v25.4/create-type.md %}) (including `ENUM`s) in views is not supported. [#108184](https://github.com/cockroachdb/cockroach/issues/108184)
 
-### User-defined functions
+##### User-defined functions
 
 - User-defined functions are not supported in partial index predicates. [#155488](https://github.com/cockroachdb/cockroach/issues/155488)
 - Views cannot reference a UDF that contains mutation statements (`INSERT`, `UPDATE`, `UPSERT`, `DELETE`). [#151686](https://github.com/cockroachdb/cockroach/issues/151686)
 
-### Stored procedures
+##### Stored procedures
 
 - Pausable portals are not supported with `CALL` statements for stored procedures. [#151529](https://github.com/cockroachdb/cockroach/issues/151529)
 
-### Mixed-isolation workloads
+##### Mixed-isolation workloads
 
 - Mixed-isolation-level workloads must enable foreign-key check locking for `SERIALIZABLE` transactions to avoid race conditions. [#151663](https://github.com/cockroachdb/cockroach/issues/151663#issuecomment-3222083180)
 
-### Data domiciling
+##### Data domiciling
 
 - When using the `infer_rbr_region_col_using_constraint` option, inserting rows with `DEFAULT` for the region column uses the database's primary region instead of inferring the region from the parent table via foreign-key constraint. [#150783](https://github.com/cockroachdb/cockroach/issues/150783)