message: docs(server): add example to serve_connection
diff: @@ -257,6 +257,34 @@ impl<B: AsRef<[u8]> + 'static> Http<B> {
  ///
  /// This returns a Future that must be polled in order for HTTP to be
  /// driven on the connection.
  + ///
  + /// # Example
  + ///
  + /// ```
  + /// # extern crate futures;
  + /// # extern crate hyper;
  + /// # extern crate tokio_core;
  + /// # extern crate tokio_io;
  + /// # use futures::Future;
  + /// # use hyper::server::{Http, Request, Response, Service};
  + /// # use tokio_io::{AsyncRead, AsyncWrite};
  + /// # use tokio_core::reactor::Handle;
  + /// # fn run<I, S>(some_io: I, some_service: S, some_handle: &Handle)
  + /// # where
  + /// # I: AsyncRead + AsyncWrite + 'static,
  + /// # S: Service<Request=Request, Response=Response, Error=hyper::Error> + 'static,
  + /// # {
  + /// let http = Http::<hyper::Chunk>::new();
  + /// let conn = http.serve_connection(some_io, some_service);
  + ///
  + /// let fut = conn
  + /// .map(|_| ())
  + /// .map_err(|e| eprintln!("server connection error: {}", e));
  + ///
  + /// some_handle.spawn(fut);
  + /// # }
  + /// # fn main() {}
  + /// ```
  pub fn serve_connection<S, I, Bd>(&self, io: I, service: S) -> Connection<I, S>
  where S: Service<Request = Request, Response = Response<Bd>, Error = ::Error>,
  Bd: Stream<Error=::Error>,
  