fix inaccurate info for docker install and usage

Author: Yuan, Kun

docs/docker.rst

@@ -57,13 +57,13 @@ if you download the docker image from `Docker Hub <https://hub.docker.com/r/blue
 
 .. code-block:: bash
 
-    sudo docker run --privileged -it --gpus all --name bluefog_gpu_deploy --shm-size=64g --network=host -v /mnt/share/ssh:/root/.ssh bluefog_gpu:latest
+    sudo docker run --privileged -it --gpus all --name bluefog_gpu_deploy --shm-size=64g --network=host -v /mnt/share/ssh:/root/.ssh bluefoglib/bluefog:gpu-0.3.0
 
 2. Run docker container with only CPU support:
 
 .. code-block:: bash
 
-    sudo docker run --privileged -it --name bluefog_cpu_deploy --network=host -v /mnt/share/ssh:/root/.ssh bluefog_cpu:latest
+    sudo docker run --privileged -it --name bluefog_cpu_deploy --network=host -v /mnt/share/ssh:/root/.ssh bluefoglib/bluefog:gpu-0.3.0
 
 3. Clean up docker system after running:
 

docs/install.rst

@@ -86,13 +86,13 @@ For more details, check :ref:`Docker Usage` page.
 
 .. code-block:: bash
 
-    sudo docker pull bluefoglib/bluefog:gpu-0.2.2
+    sudo docker pull bluefoglib/bluefog:gpu-0.3.0
 
 2. Download docker image with only CPU support:
 
 .. code-block:: bash
 
-    sudo docker pull bluefoglib/bluefog:cpu-0.2.2
+    sudo docker pull bluefoglib/bluefog:cpu-0.3.0
 
 .. _conda: https://docs.conda.io/projects/conda/en/latest/user-guide/tasks/manage-environments.html
 .. _download link: https://www.open-mpi.org/software/ompi/v4.0/