Correct one link.

doc/crypto/RSA_sign.pod

@@ -22,8 +22,8 @@ signature in B<sigret> and the signature size in B<siglen>. B<sigret>
 must point to B<RSA_size(rsa)> bytes of memory.
 
 B<type> denotes the message digest algorithm that was used to generate
-B<m>. It usually is one of B<NID_sha1>, B<NID_ripemd160> and
-B<NID_md5>; see L<objects(3)> for details. If B<type> is B<NID_md5_sha1>,
+B<m>. It usually is one of B<NID_sha1>, B<NID_ripemd160> and B<NID_md5>;
+see L<objects(3)|objects(3)> for details. If B<type> is B<NID_md5_sha1>,
 an SSL signature (MD5 and SHA1 message digests with PKCS #1 padding
 and no algorithm identifier) is created.