Remove issues added to the changelog by mistake

See https://hibernate.zulipchat.com/#narrow/channel/132094-hibernate-orm-dev/topic/Release.20automation.20and.20changelog

Author: yrodiere

changelog.txt

@@ -24,8 +24,6 @@ https://hibernate.atlassian.net/projects/HHH/versions/32614
 
 ** Bug
     * [HHH-19173] - PostgreSQLLegacySqlAstTranslator does not implement visitInArrayPredicates
-    * [HHH-19169] - Entity hierarchy (and included embeddables) with inconsistent bytecode enhancement is unsupported, but isn't detected
-    * [HHH-19168] - Re-enhancement of entities with different configuration may skip some enhancements
     * [HHH-19116] - Error when using fk() function on left joined many-to-one association and is null predicate
     * [HHH-19110] - Flush operation fails with "UnsupportedOperationException: compare() not implemented for EntityType"
     * [HHH-17151] - NPE when binding null parameter in native query with explicit TemporalType