build: use doc_auto_cfg feature for docs.rs

This improves the readability of the documentation.

Author: dodomorandi

benzina/Cargo.toml

@@ -11,6 +11,7 @@ rust-version.workspace = true
 
 [package.metadata.docs.rs]
 features = ["postgres", "mysql", "serde", "typed-uuid", "example-generated"]
+rustdoc-args = ["--cfg", "docsrs"]
 
 [dependencies]
 diesel = { version = "2.2", default-features = false, optional = true }

benzina/src/lib.rs

@@ -1,3 +1,5 @@
+#![cfg_attr(docsrs, feature(doc_auto_cfg))]
+
 #[cfg(feature = "postgres")]
 pub use self::int::{U15, U31, U63};
 #[cfg(feature = "derive")]