doc: fix some doctests after rebase

Author: tvallotton

library/alloc/src/task.rs

@@ -227,11 +227,11 @@ fn raw_waker<W: Wake + Send + Sync + 'static>(waker: Arc<W>) -> RawWaker {
 ///             // we exit, since there are no more tasks remaining on the queue
 ///             return;
 ///         };
-///         let waker = Waker::noop();
+///
 ///         // cast the Rc<Task> into a `LocalWaker`
 ///         let local_waker: LocalWaker = task.clone().into();
 ///         // Build the context using `ContextBuilder`
-///         let mut cx = ContextBuilder::from_waker(&waker)
+///         let mut cx = ContextBuilder::from_waker(Waker::noop())
 ///             .local_waker(&local_waker)
 ///             .build();
 ///

library/core/src/task/wake.rs

@@ -673,14 +673,14 @@ impl LocalWaker {
     /// #![feature(noop_waker)]
     ///
     /// use std::future::Future;
-    /// use std::task::{ContextBuilder, LocalWaker};
+    /// use std::task::{ContextBuilder, LocalWaker, Waker, Poll};
     ///
-    /// let mut cx = task::ContextBuilder::from_waker(Waker::noop())
+    /// let mut cx = ContextBuilder::from_waker(Waker::noop())
     ///     .local_waker(LocalWaker::noop())
     ///     .build();
     ///
     /// let mut future = Box::pin(async { 10 });
-    /// assert_eq!(future.as_mut().poll(&mut cx), task::Poll::Ready(10));
+    /// assert_eq!(future.as_mut().poll(&mut cx), Poll::Ready(10));
     /// ```
     #[inline]
     #[must_use]