pgAudit has been discontinued in the service

Author: jonels-msft

articles/cosmos-db/postgresql/TOC.yml

@@ -122,8 +122,6 @@
           href: concepts-monitoring.md
         - name: Performance tuning
           href: concepts-performance-tuning.md
-        - name: Audit logs
-          href: concepts-audit.md
     - name: Columnar storage
       href: concepts-columnar.md
 - name: How-to guides