Remove ref to err(7), update copyright.

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2825)
diff --git a/doc/man3/ERR_error_string.pod b/doc/man3/ERR_error_string.pod
index 7fcf2f2..695eaf2 100644
--- a/doc/man3/ERR_error_string.pod
+++ b/doc/man3/ERR_error_string.pod
@@ -59,12 +59,12 @@
 
 =head1 SEE ALSO
 
-L<err(7)>, L<ERR_get_error(3)>,
+L<ERR_get_error(3)>,
 L<ERR_print_errors(3)>
 
 =head1 COPYRIGHT
 
-Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
+Copyright 2000-2017 The OpenSSL Project Authors. All Rights Reserved.
 
 Licensed under the OpenSSL license (the "License").  You may not use
 this file except in compliance with the License.  You can obtain a copy