Dart SDK Spelling b, c, and d.

samples-dev/swarm/SwarmApp.dart

Index: samples-dev/swarm/SwarmApp.dart
diff --git a/samples-dev/swarm/SwarmApp.dart b/samples-dev/swarm/SwarmApp.dart
index 688868c4522d3a9479ecf0f6c690cadd5407c567..12d15c2934ef8a91b144471cbba52dd26fd42a13 100644
--- a/samples-dev/swarm/SwarmApp.dart
+++ b/samples-dev/swarm/SwarmApp.dart
@@ -47,7 +47,7 @@ class Swarm extends App {
     sections.refresh();
 
     // Hook up listeners about any data source additions or deletions.  We don't
-    // differeniate additions or deletions just the fact that data feeds have
+    // differentiate additions or deletions just the fact that data feeds have
     // changed.  We might want more fidelity later.
     sections.sectionTitles.forEach((title) {
       Section section = sections.findSection(title);