add TOC entry

Author: haywoodsloan

support/sql/releases/toc.yml

@@ -17,6 +17,10 @@ items:
   items:
   - name: SQL Server 2022 build versions
     href: sqlserver-2022/build-versions.md
+  - name: Cumulative Update 23
+    items:
+    - name: Cumulative Update 23 (KB5074819)
+      href: sqlserver-2022/cumulativeupdate23.md
   - name: Cumulative Update 22
     items:
     - name: Cumulative Update 22 (KB5068450)