remove doc_auto_cfg (#102)

Author: sunshowers

crates/newtype-uuid/src/lib.rs

@@ -141,7 +141,7 @@
 #![forbid(unsafe_code)]
 #![warn(missing_docs)]
 #![cfg_attr(not(feature = "std"), no_std)]
-#![cfg_attr(doc_cfg, feature(doc_cfg, doc_auto_cfg))]
+#![cfg_attr(doc_cfg, feature(doc_cfg))]
 
 #[cfg(feature = "alloc")]
 extern crate alloc;