chore: remove the doc_auto_cfg feature for docs.rs

The feature name has been removed as it was merged into the `doc_cfg` feature
and it needs to be removed or docs.rs would fail to generate the documentation.

Author: dnaka91

src/lib.rs

@@ -34,7 +34,7 @@
 //!
 //! ## Feature flags
 #![cfg_attr(feature = "doc", doc = document_features::document_features!())]
-#![cfg_attr(docsrs, feature(doc_cfg, doc_auto_cfg))]
+#![cfg_attr(docsrs, feature(doc_cfg))]
 #![warn(missing_docs, rust_2018_idioms, clippy::all, clippy::pedantic)]
 #![allow(
     clippy::missing_errors_doc,