Added newlines around docker-related Bash code snippets.

doc.zih.tu-dresden.de/README.md

@@ -134,11 +134,13 @@ docker inspect `docker ps | grep hpc-compendium | cut -d' ' -f1` | sed -n '/\<IP
 ```
 
 If you want to check whether the markdown files are formatted properly, use the following command:
+
 ```Bash
 docker run -it hpc-compendium markdownlint docs
 ```
 
 To check whether there are links that point to a wrong target, use (this may take a while and gives a lot of output because it runs over all files):
+
 ```Bash
 docker run -it hpc-compendium bash -c "find docs -type f -name '*.md' | xargs -L1 markdown-link-check"
 ```