docs(toml): display feature guarded items on docs.rs

crates/toml/Cargo.toml

@@ -35,6 +35,9 @@ pre-release-replacements = [
   {file="CHANGELOG.md", search="<!-- next-url -->", replace="<!-- next-url -->\n[Unreleased]: https://github.com/toml-rs/toml/compare/{{tag_name}}...HEAD", exactly=1},
 ]
 
+[package.metadata.docs.rs]
+rustdoc-args = ["--cfg", "docsrs"]
+
 [features]
 default = ["parse", "display"]
 parse = ["dep:toml_edit"]

crates/toml/src/lib.rs

@@ -147,6 +147,7 @@
 // and lets them ensure that there is indeed no unsafe code as opposed to
 // something they couldn't detect (e.g. unsafe added via macro expansion, etc).
 #![forbid(unsafe_code)]
+#![cfg_attr(docsrs, feature(doc_auto_cfg))]
 
 pub mod map;
 pub mod value;