Update copyright date in header comments to 2024

Author: delphidabbler

Src/UIOUtils.pas

@@ -3,7 +3,7 @@
  * v. 2.0. If a copy of the MPL was not distributed with this file, You can
  * obtain one at https://mozilla.org/MPL/2.0/
  *
- * Copyright (C) 2009-2021, Peter Johnson (gravatar.com/delphidabbler).
+ * Copyright (C) 2009-2024, Peter Johnson (gravatar.com/delphidabbler).
  *
  * Provides a container for assisting with common file operations.
 }

Src/URTFSnippetDoc.pas

@@ -3,7 +3,7 @@
  * v. 2.0. If a copy of the MPL was not distributed with this file, You can
  * obtain one at https://mozilla.org/MPL/2.0/
  *
- * Copyright (C) 2008-2023, Peter Johnson (gravatar.com/delphidabbler).
+ * Copyright (C) 2008-2024, Peter Johnson (gravatar.com/delphidabbler).
  *
  * Implements a class that renders a document that describes a snippet as rich
  * text.

Src/USnippetDoc.pas

@@ -3,7 +3,7 @@
  * v. 2.0. If a copy of the MPL was not distributed with this file, You can
  * obtain one at https://mozilla.org/MPL/2.0/
  *
- * Copyright (C) 2008-2023, Peter Johnson (gravatar.com/delphidabbler).
+ * Copyright (C) 2008-2024, Peter Johnson (gravatar.com/delphidabbler).
  *
  * Implements an abstract base class that renders a text document that describes
  * a snippet. Should be overridden by classes that generate actual documents in

Src/UTextSnippetDoc.pas

@@ -3,7 +3,7 @@
  * v. 2.0. If a copy of the MPL was not distributed with this file, You can
  * obtain one at https://mozilla.org/MPL/2.0/
  *
- * Copyright (C) 2009-2023, Peter Johnson (gravatar.com/delphidabbler).
+ * Copyright (C) 2009-2024, Peter Johnson (gravatar.com/delphidabbler).
  *
  * Implements a class that renders a document that describes a snippet as plain
  * text.