nit: Update comment.

Author: freezy

LibDmd/Frame/DmdFrame.cs

@@ -30,7 +30,7 @@ public class DmdFrame : BaseFrame, ICloneable, IEqualityComparer<DmdFrame>
 
 		/// <summary>
 		/// These frames are used for colorization and should never be rendered (if they exist, that means
-		/// there's a gray-8 frame to be rendered).
+		/// that there also exists a gray-8 frame to be rendered).
 		/// </summary>
 		public bool IsIdentifyFrame { get; private set; }
 
@@ -743,4 +743,4 @@ public void Dump(string path, string prefix = null)
 
 		#endregion
 	}
-}
+}