docs(websocket,gateway): fix rustdoc link warnings, restore -D warnings doc gate

- dispatch.rs: qualify [invoke]/[invoke_streaming] as
  [GatewayDispatch::invoke]/[::invoke_streaming] (module-level docs
  need the type-qualified path)
- byte_adapter.rs: drop redundant explicit link targets for
  DEFAULT_WS_WRITE_TIMEOUT / DEFAULT_WS_IDLE_TIMEOUT (already
  re-exported at crate::websocket)
- from_wss.rs, byte_adapter.rs: backtick WssSession::drop and the
  private WsFraming (all-features-only link errors, same class)
- Ws pump/timeout module docs spot-checked against WS-13/18/17 impls:
  no drift found

RUSTDOCFLAGS="-D warnings" cargo doc --no-deps now exits clean both
default-features and --all-features.

docs(tasks): mark review-002-fu-doc-warnings done

src/websocket/byte_adapter.rs

@@ -668,7 +668,7 @@ pub fn split_ws_to_bytes_idle(
 
 /// [`split_ws_to_bytes_idle`] with an explicit WS-18 write-progress
 /// window: `None` = the crate default
-/// ([`DEFAULT_WS_WRITE_TIMEOUT`](crate::websocket::DEFAULT_WS_WRITE_TIMEOUT)),
+/// ([`DEFAULT_WS_WRITE_TIMEOUT`]),
 /// `Some(d)` a deployment-set window.
 pub fn split_ws_to_bytes_idle_with_write(
     socket: WebSocket,
@@ -920,7 +920,7 @@ impl WsFraming for TungsteniteFraming {
 
 /// Client-side split for a tokio-tungstenite `WebSocketStream` with
 /// the default idle-read timeout
-/// ([`DEFAULT_WS_IDLE_TIMEOUT`](crate::websocket::DEFAULT_WS_IDLE_TIMEOUT)).
+/// ([`DEFAULT_WS_IDLE_TIMEOUT`]).
 /// See [`split_tungstenite_to_bytes_idle`] for the configurable form.
 #[cfg(any(test, feature = "wss"))]
 pub fn split_tungstenite_to_bytes<S>(
@@ -938,7 +938,7 @@ where
 /// axum's server-side `WebSocket`. Message semantics are identical:
 /// binary messages carry the byte stream, text is a protocol error
 /// (close 1002), close → read EOF. Both paths run the same generic
-/// pumps (WS-11); the socket flavor differs only in the [`WsFraming`]
+/// pumps (WS-11); the socket flavor differs only in the `WsFraming`
 /// impl. `idle_timeout` (WS-01): `None` = no idle bound, `Some(d)`
 /// closes the read with 1001 after `d` without an inbound WS message.
 #[cfg(any(test, feature = "wss"))]