Remove misplaced feature

ABAC was introduced in 3.15, so we shouldn't re-introduce it here.

Author: josh-wong

docs/releases/release-notes.mdx

@@ -62,7 +62,6 @@ This release includes many enhancements, improvements, bug fixes, and performanc
 
 ##### ScalarDB Cluster
 
-- Introduced the attribute-based access control (ABAC) feature in ScalarDB Cluster.
 - Added a configuration option (`scalar.db.transaction.enabled`) to enable or disable the transaction feature in ScalarDB Cluster. The default value is `true`.
 - Added support for the scanner API in the transaction abstraction to iteratively retrieve results in ScalarDB Cluster.
 - Added support for beginning transactions in read-only mode in ScalarDB Cluster.