doc: Improve the copyright notice.

doc/guix.texi

@@ -8,7 +8,19 @@
 @c %**end of header
 
 @include version.texi
-@set YEARS 2012, 2013
+
+@copying
+Copyright @copyright{} 2012, 2013 Ludovic Courtès@*
+Copyright @copyright{} 2013 Andreas Enge@*
+Copyright @copyright{} 2013 Nikita Karetnikov
+
+Permission is granted to copy, distribute and/or modify this document
+under the terms of the GNU Free Documentation License, Version 1.3 or
+any later version published by the Free Software Foundation; with no
+Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.  A
+copy of the license is included in the section entitled ``GNU Free
+Documentation License''.
+@end copying
 
 @dircategory Package management
 @direntry
@@ -31,34 +43,9 @@
 Edition @value{EDITION} @*
 @value{UPDATED} @*
 
-Copyright @copyright{} @value{YEARS} Ludovic Court@`es, Andreas Enge, Nikita Karetnikov
-
-@ifinfo
-@quotation
-Permission is granted to copy, distribute and/or modify this document
-under the terms of the GNU Free Documentation License, Version 1.3 or
-any later version published by the Free Software Foundation; with no
-Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.  A
-copy of the license is included in the section entitled ``GNU Free
-Documentation License''.
-@end quotation
-@end ifinfo
-
+@insertcopying
 @end titlepage
 
-@copying
-This manual documents GNU Guix version @value{VERSION}.
-
-Copyright @copyright{} @value{YEARS} Ludovic Courtès
-
-Permission is granted to copy, distribute and/or modify this document
-under the terms of the GNU Free Documentation License, Version 1.3 or
-any later version published by the Free Software Foundation; with no
-Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.  A
-copy of the license is included in the section entitled ``GNU Free
-Documentation License.''
-@end copying
-
 @contents
 
 @c *********************************************************************
@@ -68,18 +55,6 @@ Documentation License.''
 This document describes GNU Guix version @value{VERSION}, a functional
 package management tool written for the GNU system.
 
-
-@quotation
-Copyright @copyright{} @value{YEARS} Ludovic Courtès, Andreas Enge, Nikita Karetnikov
-
-Permission is granted to copy, distribute and/or modify this document
-under the terms of the GNU Free Documentation License, Version 1.3 or
-any later version published by the Free Software Foundation; with no
-Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.  A
-copy of the license is included in the section entitled ``GNU Free
-Documentation License.''
-@end quotation
-
 @menu
 * Introduction::                What is Guix about?
 * Installation::                Installing Guix.