docs: update NetworkActor V2 module documentation to reflect protocol changes

- Expanded the list of P2P protocols in the documentation to include Identify and mDNS.
- Clarified the retention of mDNS for local network discovery, essential for development.
- Removed references to NetworkSupervisor, Kademlia DHT, and QUIC as they are no longer part of V2.

Author: michaelgpt

app/src/actors_v2/network/mod.rs

@@ -1,10 +1,11 @@
 //! NetworkActor V2 Module
 //!
 //! Two-Actor P2P networking system with simplified protocols:
-//! - NetworkActor: P2P protocols (Gossipsub, Request-Response)
+//! - NetworkActor: P2P protocols (Gossipsub, Request-Response, Identify, mDNS)
 //! - SyncActor: Blockchain synchronization logic
 //!
-//! Removed from V1: NetworkSupervisor, Kademlia DHT, mDNS, QUIC, actor_system dependencies
+//! Removed from V1: NetworkSupervisor, Kademlia DHT, QUIC, actor_system dependencies
+//! Retained: mDNS for local network discovery (essential for local development)
 
 pub mod network_actor;
 pub mod sync_actor;