Update get-started.mdx (#19204)

be more clear that using AI Gateway requires bringing your own api key for each provider

Author: kathayl

src/content/docs/ai-gateway/get-started.mdx

@@ -32,7 +32,7 @@ When setting up a new gateway, you can choose between an authenticated and unaut
 
 Next, connect your AI provider to your gateway.
 
-AI Gateway offers multiple endpoints for each Gateway you create - one endpoint per provider, and one Universal Endpoint.
+AI Gateway offers multiple endpoints for each Gateway you create - one endpoint per provider, and one Universal Endpoint. To use AI Gateway, you will need to create your own account with each  provider and provide your API key. AI Gateway acts as a proxy for these requests, enabling observability, caching, and more.
 
 Additionally, AI Gateway has a [WebSockets API](/ai-gateway/configuration/websockets-api/) which provides a single persistent connection, enabling continuous communication. This API supports all AI providers connected to AI Gateway, including those that do not natively support WebSockets.