doc: add doc_auto_cfg feature to doc and docsrs build for mavlink and mavlink-core

mavlink-core/src/lib.rs

@@ -19,6 +19,7 @@
 //! feature without also using the `uavionix` and `icarous` features.
 //!
 #![cfg_attr(not(feature = "std"), no_std)]
+#![cfg_attr(any(docsrs, doc), feature(doc_auto_cfg))]
 #![deny(clippy::all)]
 #![warn(clippy::use_self)]
 

mavlink/src/lib.rs

 #![cfg_attr(not(feature = "std"), no_std)]
+#![cfg_attr(any(docsrs, doc), feature(doc_auto_cfg))]
 // include generate definitions
 include!(concat!(env!("OUT_DIR"), "/mod.rs"));