message: Fix typo in _HostRecv op doc string
diff: @@ -106,8 +106,8 @@ REGISTER_OP("_HostRecv")
  .Doc(R"doc(
  Receives the named tensor from send_device on recv_device.
  -_HostRecv requires its input on host memory whereas _Recv requires its
  -input on device memory.
  +_HostRecv produces its output on host memory whereas _Recv produces its
  +output on device memory.
  tensor: The tensor to receive.
  tensor_name: The name of the tensor to receive.
  