Fix referenses in section 3 manuals

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1900)
diff --git a/doc/man3/RSA_generate_key.pod b/doc/man3/RSA_generate_key.pod
index 3bafc6f..08ba6a8 100644
--- a/doc/man3/RSA_generate_key.pod
+++ b/doc/man3/RSA_generate_key.pod
@@ -72,7 +72,7 @@
 
 =head1 SEE ALSO
 
-L<ERR_get_error(3)>, L<rand(3)>,
+L<ERR_get_error(3)>, L<RAND_bytes(3)>,
 L<RSA_generate_key(3)>, L<BN_generate_prime(3)>
 
 =head1 COPYRIGHT