doc: add more doc_cfg annotations (#1821)

Also makes the `tokio::net::{tcp, udp, unix}` modules only for "utility"
types. The primary types are in `tokio::net` directly.

1 files changed, 6 insertions, 3 deletions

diff --git a/tokio/src/net/mod.rs b/tokio/src/net/mod.rs
index ac913b21..a7b98cdb 100644
--- a/tokio/src/net/mod.rs
+++ b/tokio/src/net/mod.rs
@@ -28,15 +28,18 @@ pub use addr::ToSocketAddrs;
 
 cfg_tcp! {
     pub mod tcp;
-    pub use tcp::{TcpListener, TcpStream};
+    pub use tcp::listener::TcpListener;
+    pub use tcp::stream::TcpStream;
 }
 
 cfg_udp! {
     pub mod udp;
-    pub use udp::UdpSocket;
+    pub use udp::socket::UdpSocket;
 }
 
 cfg_uds! {
     pub mod unix;
-    pub use unix::{UnixDatagram, UnixListener, UnixStream};
+    pub use unix::datagram::UnixDatagram;
+    pub use unix::listener::UnixListener;
+    pub use unix::stream::UnixStream;
 }