Merge pull request #239300 from seesharprun/cosmos-new-hub

Cosmos DB | New hub descriptions

Author: prmerger-automator[bot]

articles/cosmos-db/index.yml

@@ -1,12 +1,12 @@
 ### YamlMime:Hub
 
 title: Azure Cosmos DB documentation
-summary: Azure Cosmos DB - Fast NoSQL database with SLA-backed speed and availability, automatic and instant scalability, and open-source APIs for MongoDB and Cassandra.
+summary: Fully managed, distributed NoSQL & relational database for modern app development. High performance, high availability, and support for open-source PostgreSQL, MongoDB, and Apache Cassandra. Build cloud-native apps effortlessly.
 brand: azure
 
 metadata:
   title: Azure Cosmos DB
-  description: Azure Cosmos DB - Fast NoSQL database with SLA-backed speed and availability, automatic and instant scalability, and open-source APIs for MongoDB and Cassandra.
+  description: Fully managed, distributed NoSQL & relational database for modern apps. High performance, availability, and support for PostgreSQL, MongoDB, and Cassandra.
   services: cosmos-db
   author: seesharprun
   ms.author: sidandrews