Update the copyright year of gdb.textinfo

[Yao Qi]

Hi,
I just noticed that the copyright year of gdb.textinfo is ended on
2010, instead of 2012.  I thought it was forgot to update, and this
patch is to update it.

-- 
Yao (齐尧) 

gdb/doc:

	* gdb.textinfo: Update copyright year.

diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo
index 014cfd8..3ddf7be 100644
--- a/gdb/doc/gdb.texinfo
+++ b/gdb/doc/gdb.texinfo
@@ -45,6 +45,7 @@
 @copying
 Copyright @copyright{} 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996,
 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
+2011, 2012
 Free Software Foundation, Inc.
 
 Permission is granted to copy, distribute and/or modify this document
@@ -114,7 +115,7 @@ This is the @value{EDITION} Edition, for @value{GDBN}
 @end ifset
 Version @value{GDBVN}.
 
-Copyright (C) 1988-2010 Free Software Foundation, Inc.
+Copyright (C) 1988-2012 Free Software Foundation, Inc.
 
 This edition of the GDB manual is dedicated to the memory of Fred
 Fish.  Fred was a long-standing contributor to GDB and to Free