It makes more sense to refer to specific function manuals than the concept

manual when the specific function is refered to in the current manual text.
This correction was originally introduced in OpenBSD's tracking of OpenSSL.

doc/crypto/BN_add.pod

@@ -111,7 +111,7 @@ The error codes can be obtained by L<ERR_get_error(3)|ERR_get_error(3)>.
 
 =head1 SEE ALSO
 
-L<bn(3)|bn(3)>, L<err(3)|err(3)>, L<BN_CTX_new(3)|BN_CTX_new(3)>,
+L<bn(3)|bn(3)>, L<ERR_get_error(3)|ERR_get_error(3)>, L<BN_CTX_new(3)|BN_CTX_new(3)>,
 L<BN_add_word(3)|BN_add_word(3)>, L<BN_set_bit(3)|BN_set_bit(3)>
 
 =head1 HISTORY

doc/crypto/BN_add_word.pod

@@ -46,7 +46,7 @@ BN_mod_word() and BN_div_word() return B<a>%B<w>.
 
 =head1 SEE ALSO
 
-L<bn(3)|bn(3)>, L<err(3)|err(3)>, L<BN_add(3)|BN_add(3)>
+L<bn(3)|bn(3)>, L<ERR_get_error(3)|ERR_get_error(3)>, L<BN_add(3)|BN_add(3)>
 
 =head1 HISTORY