Update TOC.yml

Author: xboxeer

articles/mysql/TOC.yml

@@ -32,7 +32,9 @@
           - name: February 2024
             href: flexible-server/release-notes/february-2024.md
           - name: April 2024
-            href: flexible-server/release-notes/april-2024.md            
+            href: flexible-server/release-notes/april-2024.md
+          - name: May 2024
+            href: flexible-server/release-notes/may-2024.md
       - name: Service tiers
         href: flexible-server/concepts-service-tiers-storage.md
   - name: Quickstarts