Cleanup a couple unused imports in doctests
//! # #[cfg(feature = "macros")]
//! # use serde_derive::{Deserialize, Serialize};
//! # #[cfg(feature = "macros")]
-//! # use serde_with::{skip_serializing_none, DisplayFromStr};
+//! # use serde_with::skip_serializing_none;
//! # #[cfg(feature = "macros")]
//! #[skip_serializing_none]
//! # #[derive(Debug, Eq, PartialEq)]
@@ -308,8 +308,7 @@ impl Separator for CommaSeparator {
///
/// ```rust
/// # use serde_derive::{Deserialize, Serialize};
-/// # use serde_with::{As, DisplayFromStr, Same};
-/// # use std::collections::BTreeMap;
+/// # use serde_with::{As, DisplayFromStr};
/// #
/// #[derive(Deserialize, Serialize)]
/// # struct S {
