Partner Experience: update horizon config/install copy

docs/fundamentals-and-concepts/stellar-stack.mdx

@@ -15,11 +15,11 @@ Nodes reach consensus using the Stellar Consensus Protocol, which can you can le
 
 Anyone can run a Stellar Core node, but you don’t have to in order to build on Stellar. We recommend you do so if you issue an asset and want to ensure the accuracy of the ledger and/or if you want to contribute to Stellar’s overall health and decentralization. Check out our tutorial on installing, configuring, and maintaining your own node here: [Run a Core Node Tutorial](../run-core-node)
 
-## Horizon API
+## Platform Services
 
-Horizon is the client-facing RESTful HTTP API server that allows programmatic access to submit transactions and query the network’s historical data. It acts as the interface for applications that want to access the Stellar network. You can communicate with Horizon using an SDK, a web browser, or with simple command tools like cURL.
+Horizon is the client-facing RESTful HTTP API server in the platform layer which allows programmatic access to submit transactions and query the network’s historical data. It acts as the interface for applications that want to access the Stellar network. You can communicate with Horizon using an SDK, a web browser, or with simple command tools like cURL.
 
-You do not need to run your own Horizon instance — when you're getting started, you can use the free SDF Horizon instance to access the network — but it is recommended that you do when you’re ready to launch a finished product. Check out how to do so here: [Run an API Server Tutorial](../run-api-server)
+You do not need to run your own Horizon instance — when you're getting started, you can use the free SDF Horizon instance to access the network — but it is recommended that you do when you’re ready to launch a finished product. Check out how to do so here: [Run Platform Server Tutorial](../run-platform-server)
 
 Learn all there is to know about using Horizon in the Horizon [API Reference documentation](https://developers.stellar.org/api).