Update architecture.mdx

Author: jspahrsummers

docs/concepts/architecture.mdx

@@ -75,11 +75,11 @@ The transport layer handles the actual communication between clients and servers
    - Uses standard input/output for communication
    - Ideal for local processes
 
-2. **SSE transport**
+2. **HTTP with SSE transport**
    - Uses Server-Sent Events for server-to-client messages
    - HTTP POST for client-to-server messages
 
-All transports use [JSON-RPC](https://www.jsonrpc.org/) 2.0 to exchange messages. See the [specification](https://spec.modelcontextprotocol.io) for more information.
+All transports use [JSON-RPC](https://www.jsonrpc.org/) 2.0 to exchange messages. See the [specification](https://spec.modelcontextprotocol.io) for detailed information about the Model Context Protocol message format.
 
 ### Message types