cloud: update wording style, anchor links, RCU in glossary (#21901)

Author: lilin90

TOC-tidb-cloud-essential.md

@@ -240,7 +240,7 @@
     - [Overview](/vector-search/vector-search-integration-overview.md)
     - AI Frameworks
       - [LlamaIndex](/vector-search/vector-search-integrate-with-llamaindex.md)
-      - [Langchain](/vector-search/vector-search-integrate-with-langchain.md)
+      - [LangChain](/vector-search/vector-search-integrate-with-langchain.md)
     - AI Services
       - [Amazon Bedrock](/tidb-cloud/vector-search-integrate-with-amazon-bedrock.md)
     - Embedding Models/Services

TOC-tidb-cloud-starter.md

@@ -255,7 +255,7 @@
     - [Overview](/vector-search/vector-search-integration-overview.md)
     - AI Frameworks
       - [LlamaIndex](/vector-search/vector-search-integrate-with-llamaindex.md)
-      - [Langchain](/vector-search/vector-search-integrate-with-langchain.md)
+      - [LangChain](/vector-search/vector-search-integrate-with-langchain.md)
     - AI Services
       - [Amazon Bedrock](/tidb-cloud/vector-search-integrate-with-amazon-bedrock.md)
     - Embedding Models/Services

TOC-tidb-cloud.md

@@ -265,7 +265,7 @@
     - [Overview](/vector-search/vector-search-integration-overview.md)
     - AI Frameworks
       - [LlamaIndex](/vector-search/vector-search-integrate-with-llamaindex.md)
-      - [Langchain](/vector-search/vector-search-integrate-with-langchain.md)
+      - [LangChain](/vector-search/vector-search-integrate-with-langchain.md)
     - AI Services
       - [Amazon Bedrock](/tidb-cloud/vector-search-integrate-with-amazon-bedrock.md)
     - Embedding Models/Services

tidb-cloud/dedicated/_index.md

@@ -106,9 +106,9 @@ summary: TiDB Cloud is a fully-managed Database-as-a-Service (DBaaS) that brings
 
 [Manage User Profiles](https://docs.pingcap.com/tidbcloud/manage-user-access#manage-user-profiles)
 
-[Manage organization access](https://docs.pingcap.com/tidbcloud/manage-user-access#manage-organization-access)
+[Manage Organization Access](https://docs.pingcap.com/tidbcloud/manage-user-access#manage-organization-access)
 
-[Manage project access](https://docs.pingcap.com/tidbcloud/manage-user-access#manage-project-access)
+[Manage Project Access](https://docs.pingcap.com/tidbcloud/manage-user-access#manage-project-access)
 
 [Configure Password Settings](https://docs.pingcap.com/tidbcloud/configure-security-settings)
 

tidb-cloud/essential/_index.md

@@ -97,9 +97,9 @@ summary: TiDB Cloud is a fully-managed Database-as-a-Service (DBaaS) that brings
 
 [Manage User Profiles](https://docs.pingcap.com/tidbcloud/manage-user-access#manage-user-profiles/?plan=essential)
 
-[Manage organization access](https://docs.pingcap.com/tidbcloud/manage-user-access#manage-organization-access/?plan=essential)
+[Manage Organization Access](https://docs.pingcap.com/tidbcloud/manage-user-access/?plan=essential#manage-organization-access)
 
-[Manage project access](https://docs.pingcap.com/tidbcloud/manage-user-access#manage-project-access/?plan=essential)
+[Manage Project Access](https://docs.pingcap.com/tidbcloud/manage-user-access/?plan=essential#manage-project-access)
 
 [Configure Firewall Rules for Public Endpoints](https://docs.pingcap.com/tidbcloud/configure-serverless-firewall-rules-for-public-endpoints/?plan=essential)
 

tidb-cloud/starter/_index.md

@@ -97,9 +97,9 @@ summary: TiDB Cloud is a fully-managed Database-as-a-Service (DBaaS) that brings
 
 [Manage User Profiles](https://docs.pingcap.com/tidbcloud/manage-user-access#manage-user-profiles/?plan=starter)
 
-[Manage organization access](https://docs.pingcap.com/tidbcloud/manage-user-access#manage-organization-access/?plan=starter)
+[Manage Organization Access](https://docs.pingcap.com/tidbcloud/manage-user-access/?plan=starter#manage-organization-access)
 
-[Manage project access](https://docs.pingcap.com/tidbcloud/manage-user-access#manage-project-access/?plan=starter)
+[Manage Project Access](https://docs.pingcap.com/tidbcloud/manage-user-access/?plan=starter#manage-project-access)
 
 [Configure Firewall Rules for Public Endpoints](https://docs.pingcap.com/tidbcloud/configure-serverless-firewall-rules-for-public-endpoints/?plan=starter)
 

tidb-cloud/tidb-cloud-glossary.md

@@ -135,11 +135,11 @@ The place where the data of deleted clusters with valid backups is stored. Once
 
 A separate database that can be located in the same or different region and contains the same data. A replica is often used for disaster recovery purposes or to improve performance.
 
-### Replication Capacity Unit
+### Replication Capacity Unit (RCU)
 
-The replication of changefeed is charged according to the computing resources, which is the TiCDC replication capacity unit.
+TiDB Cloud measures the capacity of [changefeeds](/tidb-cloud/changefeed-overview.md) in TiCDC Replication Capacity Units (RCUs). When you create a changefeed for a cluster, you can select an appropriate specification. The higher the RCU, the better the replication performance. You will be charged for these TiCDC changefeed RCUs. For more information, see [Changefeed Cost](https://www.pingcap.com/tidb-dedicated-pricing-details/#changefeed-cost).
 
-### Request Capacity Unit
+### Request Capacity Unit (RCU)
 
 A Request Capacity Unit (RCU) is a unit of measure used to represent the provisioned compute capacity for your {{{ .essential }}} cluster. One RCU provides a fixed amount of compute resources that can process a certain number of RUs per second. The number of RCUs you provision determines your cluster's baseline performance and throughput capacity. For more information, see [{{{ .essential }}} Pricing Details](https://www.pingcap.com/tidb-cloud-essential-pricing-details/).