Normalize Comment Terminology

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

Util/Audio/Mixer/Voice.cs

@@ -6,7 +6,7 @@ using ADOFAIRenderer.Util.Audio.Clip;
 namespace ADOFAIRenderer.Util.Audio.Mixer;
 
 /// <summary>
-/// One playing sound of a <see cref="VoiceMixer"/> (the song, or one effect sound), created by <see cref="VoiceMixer.Play"/>.
+/// One playing sound of a <see cref="VoiceMixer"/> (the song, or one sound effect), created by <see cref="VoiceMixer.Play"/>.
 ///
 /// Main thread: the Set methods queue a change that takes effect at a given time (seconds relative to the render start,
 /// the time at which the game made the change). Changes of one voice must be queued in non-decreasing time order.
@@ -43,7 +43,7 @@ internal sealed class Voice
         Stop
     }
 
-    /// <summary>One timed change of a voice, queued by the main thread and applied by the render thread.</summary>
+    /// <summary>One timed change of a voice, queued by the main Unity thread and applied by the render thread.</summary>
     internal readonly struct Change
     {
         public readonly ChangeKind Kind;