(@copying): Remove the reference to not existing invariant section.

doc/tar.texi

@@ -33,11 +33,10 @@ Copyright @copyright{} 1992, 1994, 1995, 1996, 1997, 1999, 2000, 2001,
 @quotation
 Permission is granted to copy, distribute and/or modify this document
 under the terms of the GNU Free Documentation License, Version 1.1 or
-any later version published by the Free Software Foundation; with the
-Invariant Sections being "GNU General Public License", with the
-Front-Cover Texts being ``A GNU Manual,'' and with the Back-Cover Texts
-as in (a) below.  A copy of the license is included in the section
-entitled "GNU Free Documentation License".
+any later version published by the Free Software Foundation; with no
+Invariant Sections, with the Front-Cover Texts being ``A GNU Manual,''
+and with the Back-Cover Texts as in (a) below.  A copy of the license
+is included in the section entitled "GNU Free Documentation License".
 
 (a) The FSF's Back-Cover Text is: ``You are free to copy and modify
 this GNU Manual.  Buying copies from GNU Press supports the FSF in