doc for session trait

src/net/sessions/session.rs

@@ -25,6 +25,8 @@ async fn remove_sub_on_stop(p2p: P2pPtr, channel: ChannelPtr) {
 }
 
 #[async_trait]
+/// Session trait. Defines methods that are used across sessions. Implements registering the channel
+/// and initializing the channel by performing a network handshake.
 pub trait Session: Sync {
     /// Registers a new channel with the session. Performs a network handshake and starts the channel.
     async fn register_channel(