Use feature(doc_cfg) instead of feature(doc_auto_cfg) for docsrs

The feature was recently removed/merged into doc_cfg (https://users.rust-lang.org/t/fallout-from-removal-of-doc-auto-cfg/134435/1), so time to switch and fix the docsrs build.

Author: antifuchs

governor/src/lib.rs

@@ -27,7 +27,7 @@
 //! ```
 //!
 
-#![cfg_attr(docsrs, feature(doc_auto_cfg))]
+#![cfg_attr(docsrs, feature(doc_cfg))]
 #![cfg_attr(not(feature = "std"), no_std)]
 // Clippy config: Deny warnings but allow unknown lint configuration (so I can use nightly)
 #![deny(warnings)]