overview, index: update wording and add pronunciation (pingcap#3504)

Author: lilin90

_index.md

@@ -6,7 +6,7 @@ aliases: ['/docs/dev/']
 
 # TiDB Introduction
 
-[TiDB](https://github.com/pingcap/tidb) ("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.
+[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.
 

overview.md

@@ -6,11 +6,11 @@ aliases: ['/docs/dev/key-features/','/tidb/dev/key-features','/docs/dev/overview
 
 # TiDB Introduction
 
-[TiDB](https://github.com/pingcap/tidb) ("Ti" stands for Titanium) is an open-source NewSQL database that supports Hybrid Transactional and Analytical Processing (HTAP) workloads. It is MySQL compatible and features horizontal scalability, strong consistency, and high availability. The goal of TiDB is to provide users with a one-stop database solution that covers OLTP (Online Transactional Processing), OLAP (Online Analytical Processing), and HTAP services. TiDB is suitable for various use cases that require high availability and strong consistency with large-scale data.
+[TiDB](https://github.com/pingcap/tidb) (/’taɪdiːbi:/, "Ti" stands for Titanium) is an open-source NewSQL database that supports Hybrid Transactional and Analytical Processing (HTAP) workloads. It is MySQL compatible and features horizontal scalability, strong consistency, and high availability. The goal of TiDB is to provide users with a one-stop database solution that covers OLTP (Online Transactional Processing), OLAP (Online Analytical Processing), and HTAP services. TiDB is suitable for various use cases that require high availability and strong consistency with large-scale data.
 
 ## Key features
 
-- **Horizontally scaling out or scale in with only one click**
+- **Horizontally scaling out or scaling in easily**
 
     The TiDB architecture design of separating computing from storage enables you to separately scale out or scale in the computing or storage capacity online as needed. The scaling process is transparent to application operations and maintenance staff.