Update documentation attributes for management and kafka modules (#71)

Author: jmjoy

src/lib.rs

@@ -16,13 +16,12 @@
 #![warn(rust_2018_idioms, missing_docs)]
 #![warn(clippy::dbg_macro, clippy::print_stdout)]
 #![doc = include_str!("../README.md")]
-#![cfg_attr(docsrs, feature(doc_cfg))]
+#![cfg_attr(docsrs, feature(doc_auto_cfg))]
 
 pub mod common;
 pub(crate) mod error;
 pub mod logging;
 #[cfg(feature = "management")]
-#[cfg_attr(docsrs, doc(cfg(feature = "management")))]
 pub mod management;
 pub mod metrics;
 pub mod proto;

src/reporter/mod.rs

@@ -18,7 +18,6 @@
 
 pub mod grpc;
 #[cfg(feature = "kafka-reporter")]
-#[cfg_attr(docsrs, doc(cfg(feature = "kafka-reporter")))]
 pub mod kafka;
 pub mod print;
 
@@ -42,11 +41,9 @@ pub enum CollectItem {
     Meter(Box<MeterData>),
     /// Instance properties object.
     #[cfg(feature = "management")]
-    #[cfg_attr(docsrs, doc(cfg(feature = "management")))]
     Instance(Box<InstanceProperties>),
     /// Keep alive object.
     #[cfg(feature = "management")]
-    #[cfg_attr(docsrs, doc(cfg(feature = "management")))]
     Ping(Box<InstancePingPkg>),
 }