update comments for readability

benches/bench.rs

@@ -125,15 +125,14 @@ mod future_group {
         group.finish();
     }
 
-    /// This benchmark aims to measure how long it takes for the results of
-    /// futures that have become ready to be produced by the [`FutureGroup`]
-    /// stream.
+    /// This benchmark measures the latency between when futures become ready
+    /// and when their outputs appear on the [`FutureGroup`] stream.
     ///
     /// To test this, we:
     /// - insert N pending futures to the [`FutureGroup`].
     /// - until the [`FutureGroup`] is empty, we set some fraction of the
-    ///   pending futures to ready, then record how long it takes for all newly
-    ///   ready futures to be produced from [`FutureGroup`]'s `Stream` impl.
+    ///   pending futures to ready, then record how long it takes for their
+    ///   outputs to be produced from [`FutureGroup`]'s `Stream` impl.
     /// - we sum the recorded durations for each of these rounds.
     fn future_group_latency_bench(c: &mut Criterion) {
         #[derive(Debug, Clone, Copy)]