fix doctests without runtime,tcp features

Author: RalfJung

src/body/to_bytes.rs

@@ -17,7 +17,7 @@ use super::HttpBody;
 /// # Example
 ///
 /// ```
-/// # #[cfg(all(feature = "client", any(feature = "http1", feature = "http2")))]
+/// # #[cfg(all(feature = "client", feature = "tcp", any(feature = "http1", feature = "http2")))]
 /// # async fn doc() -> hyper::Result<()> {
 /// use hyper::{body::HttpBody};
 ///

src/server/mod.rs

@@ -91,6 +91,7 @@
 //! use std::net::SocketAddr;
 //! use hyper::{Body, Request, Response, Server};
 //! use hyper::service::{make_service_fn, service_fn};
+//! # #[cfg(feature = "runtime")]
 //! use hyper::server::conn::AddrStream;
 //!
 //! #[derive(Clone)]