Update VoiceMemos.swift

(cherry picked from commit 008af25c2af65a21ea535010e2f32fc6559974c8)

Author: mbrandonw

Examples/VoiceMemos/VoiceMemos/VoiceMemos.swift

@@ -244,8 +244,9 @@ struct VoiceMemos_Previews: PreviewProvider {
         ),
         reducer: voiceMemosReducer,
         environment: VoiceMemosEnvironment(
+          // NB: AVAudioRecorder and AVAudioPlayer doesn't work in previews, so use mocks 
+          //     that simulate their behavior in previews.
           audioPlayer: .mock,
-          // NB: AVAudioRecorder doesn't work in previews, so we stub out the dependency here.
           audioRecorder: .mock,
           mainRunLoop: QueueScheduler.main,
           openSettings: {},