Adding customer stories to TOC

Author: JasonWHowell

articles/mysql/TOC.yml

@@ -136,4 +136,4 @@
   - name: Support options
     href: https://azure.microsoft.com/support/options/
   - name: Customer stories
-    href: https://customers.microsoft.com/search?sq="Azure%20Database%20for%20MySQL%20"
+    href: https://customers.microsoft.com/en-us/search?sq="Azure%20Database%20for%20MySQL%20"

articles/postgresql/TOC.yml

@@ -124,4 +124,4 @@
   - name: Support options
     href: https://azure.microsoft.com/support/options/
   - name: Customer stories
-    href: https://customers.microsoft.com/search?sq="Azure%20Database%20for%20PostgreSQL%20"
+    href: https://customers.microsoft.com/en-us/search?sq="Azure%20Database%20for%20PostgreSQL%20"