Update copyright dates to 2023

I noticed that in the latest version, the copyright string is still
2022, even though 2023 is halfway through.  This patch fixes that and
fixes the documentation along with it.

Signed-off-by: Enze Li <lienze@kylinos.cn>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20230525064345.1152801-1-lienze@kylinos.cn
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

docs/conf.py

@@ -89,7 +89,7 @@
 
 # General information about the project.
 project = u'QEMU'
-copyright = u'2022, The QEMU Project Developers'
+copyright = u'2023, The QEMU Project Developers'
 author = u'The QEMU Project Developers'
 
 # The version info for the project you're documenting, acts as replacement for

include/qemu/help-texts.h

@@ -2,7 +2,7 @@
 #define QEMU_HELP_TEXTS_H
 
 /* Copyright string for -version arguments, About dialogs, etc */
-#define QEMU_COPYRIGHT "Copyright (c) 2003-2022 " \
+#define QEMU_COPYRIGHT "Copyright (c) 2003-2023 " \
     "Fabrice Bellard and the QEMU Project developers"
 
 /* Bug reporting information for --help arguments, About dialogs, etc */