Update task.rs

library/alloc/src/task.rs

diff --git a/library/alloc/src/task.rs b/library/alloc/src/task.rs
index bc668f7..45c22b84 100644
--- a/library/alloc/src/task.rs
+++ b/library/alloc/src/task.rs
@@ -37,6 +37,10 @@
 ///      link ../../std/task/struct.Waker.html#impl-From%3CArc%3CW,+Global%3E%3E-for-Waker
 ///      without getting a link-checking error in CI. -->
 ///
+/// # Memory Ordering
+///
+/// To avoid missed wakeups, all runtimes must adhere to the requirement described for [`Waker::wake`].
+///
 /// # Examples
 ///
 /// A basic `block_on` function that takes a future and runs it to completion on