fix typo
myregistrydomain.com/my-ubuntu -> myregistry.domain.com/my-ubuntu
@@ -229,9 +229,9 @@ If you have been issued an _intermediate_ certificate instead, see
```bash
$ docker pull ubuntu:16.04
- $ docker tag ubuntu:16.04 myregistrydomain.com/my-ubuntu
- $ docker push myregistrydomain.com/my-ubuntu
- $ docker pull myregistrydomain.com/my-ubuntu
+ $ docker tag ubuntu:16.04 myregistry.domain.com/my-ubuntu
+ $ docker push myregistry.domain.com/my-ubuntu
+ $ docker pull myregistry.domain.com/my-ubuntu
```
#### Use an intermediate certificate
