fix: removed #![feature(doc_cfg)] nightly feature

libraries/native_model/src/codec/postcard_1_0.rs

@@ -1,6 +1,7 @@
 //! ⚠️ [`Read the docs before using`](crate::postcard_1_0::PostCard#warning) -
-//! Annotate your type with `native_model::postcard_1_0::PostCard` to
-//! use the postcard 1.0 crate for serializing & deserializing.
+//! Enable the `postcard_1_0` feature and annotate your type with
+//! `native_model::postcard_1_0::PostCard` to have `native_db` use the postcard
+//! 1.0 crate for serializing & deserializing.
 
 /// Used to specify the [postcard](https://crates.io/crates/postcard/1.0.8)
 /// `1.0` crate for serialization & deserialization.
@@ -10,21 +11,25 @@
 /// `postcard` does not implement all [serde](https://crates.io/crates/serde)
 /// features. Errors may be encountered when using this with some types.
 ///
+/// If you are encountering errors when using this codec on your types, try
+/// using the `rmp_serde_1_3` codec instead.
+///
 /// # Basic usage
 ///
-/// Use the [`with`](crate::native_model) attribute on your type to instruct
+/// After enabling the `postcard_1_0` feature in your `Cargo.toml`, use the
+/// [`with`](crate::native_model) attribute on your type to instruct
 /// `native_model` to use `PostCard` for serialization & deserialization.
 ///
-/// Example:
+/// Example usage:
 ///
 /// ```rust
+/// #[derive(Clone, Default, serde::Deserialize, serde::Serialize)]
 /// #[native_model(id = 1, version = 1, with = native_model::postcard_1_0::PostCard)]
 /// struct MyStruct {
 ///     my_string: String
 /// }
 /// ```
 
-#[doc(cfg(all(feature = "serde", feature = "postcard_1_0")))]
 pub struct PostCard;
 
 #[cfg(all(feature = "serde", feature = "postcard_1_0"))]