Rollup merge of #94989 - compiler-errors:stream-alias, r=Dylan-DPC

Add Stream alias for AsyncIterator

Fixes #94965

library/core/src/async_iter/async_iter.rs

@@ -12,6 +12,7 @@ use crate::task::{Context, Poll};
 /// [impl]: index.html#implementing-async-iterator
 #[unstable(feature = "async_iterator", issue = "79024")]
 #[must_use = "async iterators do nothing unless polled"]
+#[doc(alias = "Stream")]
 pub trait AsyncIterator {
     /// The type of items yielded by the async iterator.
     type Item;