Corrects a cfg feature declaration in task/mod.rs
#[doc(inline)]
pub use std::task::{Context, Poll, Waker};
-#[cfg(feature = "unstable")]
+#[cfg(any(feature = "unstable", feature = "docs"))]
#[cfg_attr(feature = "docs", doc(cfg(unstable)))]
#[doc(inline)]
pub use async_macros::ready;
