Rollup merge of rust-lang#76840 - poliorcetics:intra-doc-core-sync-and-future, r=jyn514

Move to intra doc links in core/src/future

Helps with rust-lang#75080.

@rustbot modify labels: T-doc A-intra-doc-links

r? @jyn514

Author: RalfJung

library/core/src/future/pending.rs

@@ -7,10 +7,8 @@ use crate::task::{Context, Poll};
 /// Creates a future which never resolves, representing a computation that never
 /// finishes.
 ///
-/// This `struct` is created by the [`pending`] function. See its
+/// This `struct` is created by [`pending()`]. See its
 /// documentation for more.
-///
-/// [`pending`]: fn.pending.html
 #[stable(feature = "future_readiness_fns", since = "1.48.0")]
 #[must_use = "futures do nothing unless you `.await` or poll them"]
 pub struct Pending<T> {

library/core/src/future/poll_fn.rs

@@ -33,10 +33,8 @@ where
 
 /// A Future that wraps a function returning `Poll`.
 ///
-/// This `struct` is created by the [`poll_fn`] function. See its
+/// This `struct` is created by [`poll_fn()`]. See its
 /// documentation for more.
-///
-/// [`poll_fn`]: fn.poll_fn.html
 #[must_use = "futures do nothing unless you `.await` or poll them"]
 #[unstable(feature = "future_poll_fn", issue = "72302")]
 pub struct PollFn<F> {

library/core/src/future/ready.rs

@@ -4,10 +4,8 @@ use crate::task::{Context, Poll};
 
 /// Creates a future that is immediately ready with a value.
 ///
-/// This `struct` is created by the [`ready`] function. See its
+/// This `struct` is created by [`ready()`]. See its
 /// documentation for more.
-///
-/// [`ready`]: fn.ready.html
 #[stable(feature = "future_readiness_fns", since = "1.48.0")]
 #[derive(Debug, Clone)]
 #[must_use = "futures do nothing unless you `.await` or poll them"]