Remove information on maintaining copyright years; it does not belong

here and is in admin/notes anyway.

etc/CONTRIBUTE

@@ -183,25 +183,6 @@ of the Emacs Lisp Reference Manual may also help.
 The file etc/DEBUG describes how to debug Emacs bugs.
 
 
-
-* How to Maintain Copyright Years for GNU Emacs
-
-See admin/notes/copyright.
-
-** Our lawyer says it is ok if we add, to each file that has been in Emacs
-since Emacs 21 came out in 2001, all the subsequent years.  We don't
-need to check whether *that file* was changed in those years.
-It's sufficient that *Emacs* was changed in those years (and it was!).
-
-** For those files that have been added since then, we should add
-the year it was added to Emacs, and all subsequent years.
-
-** For the refcards under etc/, it's ok to simply use the latest year
-(typically in a `\def\year{YEAR}' expression) for the rendered copyright
-notice, while maintaining the full list of years in the copyright notice
-in the comments.
-
-
 
 This file is part of GNU Emacs.