Avoid the word "slab" in comment to avoid confusion with slab crate

Author: MajorBreakfast

futures-util/src/stream/buffer_unordered.rs

@@ -106,7 +106,7 @@ where
         cx: &mut Context<'_>,
     ) -> Poll<Option<Self::Item>> {
         // First up, try to spawn off as many futures as possible by filling up
-        // our slab of futures.
+        // our queue of futures.
         while self.in_progress_queue.len() < self.max {
             match self.as_mut().stream().poll_next(cx) {
                 Poll::Ready(Some(fut)) => self.as_mut().in_progress_queue().push(fut),

futures-util/src/try_stream/try_buffer_unordered.rs

@@ -84,7 +84,7 @@ impl<St> Stream for TryBufferUnordered<St>
         cx: &mut Context<'_>,
     ) -> Poll<Option<Self::Item>> {
         // First up, try to spawn off as many futures as possible by filling up
-        // our slab of futures. Propagate errors from the stream immediately.
+        // our queue of futures. Propagate errors from the stream immediately.
         while self.in_progress_queue.len() < self.max {
             match self.as_mut().stream().poll_next(cx)? {
                 Poll::Ready(Some(fut)) => self.as_mut().in_progress_queue().push(fut.into_future()),