Update README.md

structure

Author: AlexanderHodicke

cloud-infrastructure/networking/network-architectures/README.md

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 This collection will hold various network architectures for different types of workloads
 
+Reviewed: 06.02.2024
 
+# Useful Links
 
-
-### Reference Architectures & Step-by-step Guides
-
+## Reference Architectures & Step-by-step Guides
 
 - [Define Your Network and Connectivity Architecture Best Practice](https://docs.oracle.com/en/solutions/oci-best-practices/define-your-network-and-connectivity-architecture1.html#GUID-88B208F6-62AD-44EB-BFD1-4F0ACC6FA85A)
 
 - [Reference OCI Networking Architecture - Oracle E-Business Suite Applications](https://blogs.oracle.com/ateam/post/reference-oci-networking-architecture-oracle-ebusiness-suite-applications)
 
-### Blogs
+## Blogs
 
 - [OCI network architectures for multiple tenancies](https://blogs.oracle.com/ateam/post/oci-network-architectures-for-multiple-tenancies)
 
 
-### Videos & Podcasts
+## Videos & Podcasts
 
 - [Top 10 Network Architecture Decisions in OCI Part 1](https://www.youtube.com/watch?v=FH3H84sQLw8)
 - [Top 10 Network Architecture Decisions in OCI Part 2](https://www.youtube.com/watch?v=3GIQBaXOAIg)
@@ -28,4 +28,4 @@ Copyright (c) 2024 Oracle and/or its affiliates.
 
 Licensed under the Universal Permissive License (UPL), Version 1.0.
 
-See [LICENSE](https://github.com/oracle-devrel/technology-engineering/blob/main/LICENSE) for more details.
+See [LICENSE](https://github.com/oracle-devrel/technology-engineering/blob/main/LICENSE) for more details.