Fix markdown

README.md

@@ -28,17 +28,17 @@ Visiting `http://<hostname>:8888/?token=<token>` in a browser loads the Jupyter
 where `hostname` is the name of the computer running docker and `token` is the secret token printed in the console.
 The container remains intact for restart after the notebook server exits.
 
-    ```bash
-    docker run -p 8888:8888 jupyter/scipy-notebook:33add21fab64
-    ```
+```bash
+docker run -p 8888:8888 jupyter/scipy-notebook:33add21fab64
+```
 
 **Example 2:** This command performs the same operations as **Example 1**, but it exposes the server on host port 10000 instead of port 8888.
 Visiting `http://<hostname>:10000/?token=<token>` in a browser loads JupyterLab,
 where `hostname` is the name of the computer running docker and `token` is the secret token printed in the console.
 
-    ```bash
-    docker run -p 10000:8888 jupyter/scipy-notebook:33add21fab64
-    ```
+```bash
+docker run -p 10000:8888 jupyter/scipy-notebook:33add21fab64
+```
 
 **Example 3:** This command pulls the `jupyter/datascience-notebook` image tagged `33add21fab64` from Docker Hub if it is not already present on the local host.
 It then starts an _ephemeral_ container running a Jupyter Notebook server and exposes the server on host port 10000.
@@ -48,9 +48,9 @@ Visiting `http://<hostname>:10000/?token=<token>` in a browser loads JupyterLab,
 where `hostname` is the name of the computer running docker and `token` is the secret token printed in the console.
 Docker destroys the container after notebook server exit, but any files written to `~/work` in the container remain intact on the host.
 
-    ```bash
-    docker run --rm -p 10000:8888 -e JUPYTER_ENABLE_LAB=yes -v "${PWD}":/home/jovyan/work jupyter/datascience-notebook:33add21fab64
-    ```
+```bash
+docker run --rm -p 10000:8888 -e JUPYTER_ENABLE_LAB=yes -v "${PWD}":/home/jovyan/work jupyter/datascience-notebook:33add21fab64
+```
 
 ## Contributing