docs: updates in ChainHub section

Author: rabi-siddique

main/guides/orchestration/getting-started/key-concepts.md

@@ -48,7 +48,10 @@ const stackAndSwapFn = async (orch, ...) => {
 
 ### ChainHub
 
-The `makeChainHub` utility manages the connections and metadata for various blockchain networks. It simplifies accessing and interacting with multiple chains, providing a unified interface for the orchestration logic to manage cross-chain operations effectively. ChainHub also allows for dynamic registration and usage of chains.
+The `makeChainHub` utility manages the connections and metadata for various blockchain networks. It creates a new `ChainHub` instance implementing the [`ChainHubI`](https://github.com/Agoric/agoric-sdk/blob/000693442f821c1fcea007a2df740733b1f75ebe/packages/orchestration/src/exos/chain-hub.js#L70-L80C4) interface.
+
+It simplifies accessing and interacting with multiple chains, providing a unified interface for the orchestration logic to manage cross-chain operations effectively.
+ChainHub also allows dynamic registration and use of chain and connection information.
 
 ```javascript
 const chainHub = makeChainHub(remotePowers.agoricNames);
@@ -68,7 +71,7 @@ In this example, `chainHub` is used to register a new chain and establish a conn
 
 ### Orchestration Account
 
-Orchestration accounts are a key concept in the Agoric Orchestration API, represented by the [OrchestrationAccountI](https://github.com/Agoric/agoric-sdk/blob/000693442f821c1fcea007a2df740733b1f75ebe/packages/orchestration/src/orchestration-api.ts#L131-L175C2) interface. These accounts provide high-level operations for managing accounts on remote chains, allowing seamless interaction and management of interchain accounts. The orchestration accounts abstract the complexity of interchain interactions, providing a unified and simplified interface for developers.
+Orchestration accounts are a key concept in the Agoric Orchestration API, represented by the [`OrchestrationAccountI`](https://agoric-sdk.pages.dev/interfaces/_agoric_orchestration.OrchestrationAccountI) interface. These accounts provide high-level operations for managing accounts on remote chains, allowing seamless interaction and management of interchain accounts. The orchestration accounts abstract the complexity of interchain interactions, providing a unified and simplified interface for developers.
 
 **1. Address Management**