Remove doc_cfg from the list of features

Co-authored-by: Tony Arcieri (iqlusion) <[email protected]>

Author: fjarri

src/lib.rs

@@ -67,7 +67,7 @@
 #![deny(missing_docs)]
 #![deny(meta_variable_misuse)]
 #![no_std]
-#![cfg_attr(docsrs, feature(doc_cfg, doc_auto_cfg))]
+#![cfg_attr(docsrs, feature(doc_auto_cfg))]
 
 #[cfg(feature = "const-default")]
 extern crate const_default;