Deriving Serialize/Deserialize on remote types causes `missing_docs` errors

Minimal example:

//! FOO

#![deny(missing_docs)]

use serde_derive::{Deserialize, Serialize};

/// X
pub struct X { f: u32 }

/// Remote X
#[derive(Deserialize, Serialize)]
#[serde(remote = "X")]
pub struct XDef { f: u32 }

   Compiling playground v0.0.1 (/playground)
error: missing documentation for a method
  --> src/lib.rs:11:20
   |
11 | #[derive(Deserialize, Serialize)]
   |                    ^
   |
note: lint level defined here
  --> src/lib.rs:3:9
   |
3  | #![deny(missing_docs)]
   |         ^^^^^^^^^^^^

error: missing documentation for a method
  --> src/lib.rs:11:31
   |
11 | #[derive(Deserialize, Serialize)]
   |                               ^

error: aborting due to 2 previous errors

Start with the minimal Rust example and the serde_derive::{Deserialize, Serialize} remote-type derives shown in the issue. Inspect the generated methods associated with #[serde(remote = "X")] and verify the example no longer reports missing_docs errors when compiled with #![deny(missing_docs)].