committing the toc for three use cases related to back up (#468)

Signed-off-by: shanrajad23 <[email protected]>

src/toc-use-case.md

@@ -6,4 +6,7 @@ This is the table of contents from which the Tanzu Solutions Workbooks Documenta
     - [High Availability Failover in PostgreSQL backed by Tanzu](./reference-designs/postgres-sql.md)
     - [Exposing TAP Workloads Outside the Cluster Using AVI L4/L7](./solution-workbooks/tap-workloads-avi-l4-l7.md)
     - [Backing Up & Restoring VMware SQL with MySQL Instances for TAS](./solution-workbooks/backup-vmwaresql-tas.md)
-    - [Installing Velero in Tanzu Kubernetes Cluster](./solution-workbooks/velero-with-restic.md)
+    - [Installing Velero in Tanzu Kubernetes Cluster](./solution-workbooks/velero-with-restic.md)
+    - [Backing Up and Restoring the Apache Kafka Deployments on Tanzu Kubernetes Grid](./solution-workbooks/kafka-backup.md)
+    - [Backing Up and Restoring the MongoDB Deployments on Tanzu Kubernetes Grid](./solution-workbooks/mongodb-backup.md)
+    - [Backing Up and Restoring the Redis Deployments on Tanzu Kubernetes Grid](./solution-workbooks/redis-backup.md)