Auto merge of #116528 - daxpedda:stabilize-ready-into-inner, r=dtolnay

Auto merge of #116528 - daxpedda:stabilize-ready-into-inner, r=dtolnay · patricklam/verify-rust-std@88927ac

Original file line number	Diff line number	Diff line change
`@@ -34,13 +34,12 @@ impl<T> Ready<T> {`
`34`	`34`	`/// # Examples`
`35`	`35`	`///`
`36`	`36`	/// ```
`37`		`- /// #![feature(ready_into_inner)]`
`38`	`37`	`/// use std::future;`
`39`	`38`	`///`
`40`	`39`	`/// let a = future::ready(1);`
`41`	`40`	`/// assert_eq!(a.into_inner(), 1);`
`42`	`41`	/// ```
`43`		`- #[unstable(feature = "ready_into_inner", issue = "101196")]`
	`42`	`+ #[stable(feature = "ready_into_inner", since = "CURRENT_RUSTC_VERSION")]`
`44`	`43`	`#[must_use]`
`45`	`44`	`#[inline]`
`46`	`45`	`pub fn into_inner(self) -> T {`