Migrate to doc_auto_cfg

Cargo.toml

@@ -51,7 +51,7 @@ rustc-dep-of-std = [
 test-in-browser = []
 
 [package.metadata.docs.rs]
-features = ["std", "custom"]
+features = ["std", "custom", "zeroize"]
 rustdoc-args = ["--cfg", "docsrs"]
 
 # workaround for https://github.com/cross-rs/cross/issues/1345

src/custom.rs

@@ -73,7 +73,6 @@ use core::{mem::MaybeUninit, num::NonZeroU32};
 /// [top-level documentation](index.html#custom-implementations) this
 /// registration only has an effect on unsupported targets.
 #[macro_export]
-#[cfg_attr(docsrs, doc(cfg(feature = "custom")))]
 macro_rules! register_custom_getrandom {
     ($path:path) => {
         // TODO(MSRV 1.37): change to unnamed block

src/error_impls.rs

@@ -5,7 +5,6 @@
 // <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
-#![cfg_attr(docsrs, doc(cfg(feature = "std")))]
 extern crate std;
 
 use crate::Error;

src/lib.rs

@@ -191,7 +191,7 @@
 )]
 #![no_std]
 #![warn(rust_2018_idioms, unused_lifetimes, missing_docs)]
-#![cfg_attr(docsrs, feature(doc_cfg))]
+#![cfg_attr(docsrs, feature(doc_auto_cfg))]
 
 #[macro_use]
 extern crate cfg_if;
@@ -362,7 +362,6 @@ pub fn getrandom_uninit(dest: &mut [MaybeUninit<u8>]) -> Result<&mut [u8], Error
 /// # Ok(()) }
 /// ```
 #[cfg(feature = "zerocopy")]
-#[cfg_attr(docsrs, doc(cfg(feature = "zerocopy")))]
 #[inline]
 pub fn value<T: zerocopy::FromBytes + Sized>() -> Result<T, Error> {
     let mut value = MaybeUninit::<T>::uninit();