Rephrase "bidirectional communication"

Author: jspahrsummers

docs/specification/draft/basic/transports.md

@@ -59,7 +59,8 @@ In the **Streamable HTTP** transport, the server operates as an independent proc
 can handle multiple client connections. This transport uses standard HTTP with optional
 [Server-Sent Events](https://en.wikipedia.org/wiki/Server-sent_events) (SSE) for
 streaming multiple server messages. This permits "plain HTTP" MCP servers, as well as
-more feature-rich servers supporting streaming and bidirectional communication.
+more feature-rich servers supporting streaming and server-to-client notifications and
+requests.
 
 The server **MUST** provide a single HTTP endpoint (hereafter referred to as the **MCP
 endpoint**) that supports both POST and GET methods. For example, this could be a URL