index page: updated the phase of TiDB Cloud from Beta to Public Previ…

…ew (#6014)

_index.md

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 [TiDB](https://github.com/pingcap/tidb) (/’taɪdiːbi:/, "Ti" stands for Titanium) is an open-source, distributed, NewSQL database that supports Hybrid Transactional and Analytical Processing (HTAP) workloads. It is MySQL compatible and features horizontal scalability, strong consistency, and high availability. TiDB can be deployed on-premise or in-cloud.
 
-Designed for the cloud, TiDB provides flexible scalability, reliability and security on the cloud platform. Users can elastically scale TiDB to meet the requirements of their changing workloads. [TiDB Operator](https://docs.pingcap.com/tidb-in-kubernetes/v1.1/tidb-operator-overview) helps manage TiDB on Kubernetes and automates operating tasks, which makes TiDB easier to deploy on any cloud that provides managed Kubernetes. [TiDB Cloud](https://pingcap.com/products/tidbcloud) (Beta), the fully-managed TiDB service, is the easiest, most economical, and most resilient way to unlock the full power of [TiDB in the cloud](https://docs.pingcap.com/tidbcloud/beta), allowing you to deploy and run TiDB clusters with just a few clicks.
+Designed for the cloud, TiDB provides flexible scalability, reliability and security on the cloud platform. Users can elastically scale TiDB to meet the requirements of their changing workloads. [TiDB Operator](https://docs.pingcap.com/tidb-in-kubernetes/v1.1/tidb-operator-overview) helps manage TiDB on Kubernetes and automates operating tasks, which makes TiDB easier to deploy on any cloud that provides managed Kubernetes. [TiDB Cloud](https://pingcap.com/products/tidbcloud) (Public Preview), the fully-managed TiDB service, is the easiest, most economical, and most resilient way to unlock the full power of [TiDB in the cloud](https://docs.pingcap.com/tidbcloud/beta), allowing you to deploy and run TiDB clusters with just a few clicks.
 
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