Update copyright dates of documentation

diff --git a/doc/pspp.texi b/doc/pspp.texi
index 204feada5862577aad02fbdf37cbf51b6c870e80..3598cd1df3ff0b3c91a20abb41ca19954e941226 100644 (file)
--- a/doc/pspp.texi
+++ b/doc/pspp.texi
@@ -1,6 +1,6 @@
 \input texinfo @c -*- texinfo -*-
 @c PSPP - a program for statistical analysis.
-@c Copyright (C) 2017, 2019, 2020 Free Software Foundation, Inc.
+@c Copyright (C) 2017, 2019, 2020, 2023 Free Software Foundation, Inc.
 @c Permission is granted to copy, distribute and/or modify this document
 @c under the terms of the GNU Free Documentation License, Version 1.3
 @c or any later version published by the Free Software Foundation;
@@ -138,7 +138,7 @@ graphic user interface
 This manual is for GNU PSPP version @value{VERSION},
 software for statistical analysis.
 
-Copyright @copyright{} 1997, 1998, 2004, 2005, 2009, 2012, 2013, 2014, 2016, 2019, 2020 Free Software Foundation, Inc.
+Copyright @copyright{} 1997, 1998, 2004, 2005, 2009, 2012, 2013, 2014, 2016, 2019, 2020, 2023 Free Software Foundation, Inc.
 
 @quotation
 Permission is granted to copy, distribute and/or modify this document