condenser_api.get_key_references using wrong key as an example

It isn't the most important thing, but I noticed it while I was working on some integration tests. Key used there STM5jZtLoV8YbxCxr4imnbWn61zMB24wwonpnVhfXRmv7j6fk3dTH is for steemit1, while documentation says it should return hiveio as expected output. I think this needs to be updated to use one of hiveio's public keys so example would be consistent.