[Docker][Documentation] Uses new docker data image from Docker Hub...

[Docker][Documentation] Uses new docker data image from Docker Hub (*sytse/gitlab-data*). Uniform tag name for data image is now *gitlab-data*.

docker/README.md

@@ -80,7 +80,7 @@ sudo docker pull sytse/gitlab-app:7.10.1
 
 ```bash
 sudo docker run --name gitlab-data sytse/gitlab-data /bin/true
-sudo docker run --detach --name gitlab_app --publish 8080:80 --publish 2222:22 --volumes-from gitlab_data sytse/gitlab-app:7.10.1
+sudo docker run --detach --name gitlab-app --publish 8080:80 --publish 2222:22 --volumes-from gitlab-data sytse/gitlab-app:7.10.1
 ```
 
 After this you can login to the web interface as explained above in 'After starting a container'.
@@ -130,7 +130,7 @@ It Assumes that you're upgrading from 7.8.1 to 7.10.1 and you're in the updated
 sudo docker stop gitlab-app
 sudo docker rm gitlab-app
 sudo docker build --tag gitlab-app:7.10.1 docker/app/
-sudo docker run --detach --name gitlab-app --publish 8080:80 --publish 2222:22 --volumes-from gitlab_data gitlab-app:7.10.1
+sudo docker run --detach --name gitlab-app --publish 8080:80 --publish 2222:22 --volumes-from gitlab-data gitlab-app:7.10.1
 ```
 
 On the first run GitLab will reconfigure and update itself. If everything runs OK don't forget to cleanup the app image:
@@ -143,13 +143,13 @@ sudo docker rmi gitlab-app:7.8.1
 
 - Ensure the containers are running
 - Login to Dockerhub with `sudo docker login`
-- Run the following (replace '7.9.2' with the version you're using and 'Sytse Sijbrandij' with your name):
+- Run the following (replace '7.10.1' with the version you're using and 'Sytse Sijbrandij' with your name):
 
 ```bash
 sudo docker commit -m "Initial commit" -a "Sytse Sijbrandij" gitlab-app sytse/gitlab-app:7.10.1
 sudo docker push sytse/gitlab-app:7.10.1
-sudo docker commit -m "Initial commit" -a "Sytse Sijbrandij" gitlab_data sytse/gitlab_data
-sudo docker push sytse/gitlab_data
+sudo docker commit -m "Initial commit" -a "Sytse Sijbrandij" gitlab-data sytse/gitlab-data
+sudo docker push sytse/gitlab-data
 ```
 
 ## Troubleshooting