Updated comments and minor fixes.

Sources/SwiftMath/MathRender/MTLabel.swift

@@ -1,8 +1,9 @@
 //
-//  MTLabel.swift
-//  MathRenderSwift
-//
 //  Created by Mike Griebling on 2022-12-31.
+//  Translated from an Objective-C implementation by 安志钢.
+//
+//  This software may be modified and distributed under the terms of the
+//  MIT license. See the LICENSE file for details.
 //
 
 import Foundation
@@ -25,6 +26,7 @@ public class MTLabel : NSTextField {
         super.init(coder: coder)
     }
     
+    // MARK: - Customized getter and setter methods for property text.
     var text:String? {
         get { super.stringValue }
         set { super.stringValue = newValue! }