fix typo

pkgs/sse/example/index.dart

diff --git a/pkgs/sse/example/index.dart b/pkgs/sse/example/index.dart
index afc1a49..0ed7596 100644
--- a/pkgs/sse/example/index.dart
+++ b/pkgs/sse/example/index.dart
@@ -9,7 +9,7 @@
   var channel = SseClient('/sseHandler');
 
   channel.stream.listen((s) {
-    // Listen for messages and send the back.
+    // Listen for messages and send them back.
     channel.sink.add(s);
   });
 }