Adding Spring data developer guide TOC entry

Author: SnehaGunda

articles/cosmos-db/TOC.yml

@@ -1048,6 +1048,9 @@
       - name: Use Spring Boot Starter
         href: /java/azure/spring-framework/configure-spring-boot-starter-java-app-with-cosmos-db
         maintainContext: true
+      - name: Spring Data developer guide
+        href: /java/azure/java/spring-framework/how-to-guides-spring-data-cosmosdb
+        maintainContext: true
       - name: ODBC driver 
         href: odbc-driver.md
     - name: Migrate data to Cosmos DB