maint: merge stable to default

Author: Rik

doc/refcard/refcard.tex

@@ -378,7 +378,7 @@
 % -------------------------------------
 
 {\vbbf Octave Quick Reference}\hfil{\smrm Octave \octaveversion}\qquad
-{\smrm Copyright 1996-2025 The Octave Project Developers}
+{\smrm Copyright\thinspace\copyright\thinspace 1996-2025 The Octave Project Developers}
 
 \altsec Starting and Stopping;
 octave \opt{-\hbox{}-gui}&start Octave CLI/GUI session\cr
@@ -791,9 +791,10 @@
 \par\vskip10pt
 {\smrm\parskip=6pt
 Quick reference for Octave \octaveversion.
-Copyright 1996-2025 The Octave Project Developers.  The authors assume
-no responsibility for any errors on this card.  This card may be freely
-distributed under the terms of the GNU General Public License.
+Copyright\thinspace\copyright\thinspace 1996-2025 The Octave Project
+Developers.  The authors assume no responsibility for any errors on this card.
+This card may be freely distributed under the terms of the GNU General Public
+License.
 
 Octave license and copyright: https://octave.org/copyright/