Merge pull request docker#237 from mbentley/fix-userns-formatting

Fixed code block formatting issues with indentation

Author: Mano Marks

security/userns/README.md

@@ -35,7 +35,6 @@ You must perform this step while logged in as the **ubuntu** user.
 
    root      8715  0.0  1.0 352332 38820 ?        Ssl  12:56   0:01 /usr/bin/dockerd -H fd://
    ubuntu    8896  0.0  0.0   8216  2188 pts/0    S+   13:45   0:00 grep --color=auto dockerd
-
    ```
 
   The first line shows the Docker daemon (**dockerd**). The second line shows the `ps` command you just ran. The first column of the first line shows that the Docker daemon is running as **root**.
@@ -48,12 +47,11 @@ You must perform this step while logged in as the **ubuntu** user.
    ubuntu@node:~$ sudo docker run --rm alpine id
 
    Unable to find image 'alpine:latest' locally
-latest: Pulling from library/alpine
-e110a4a17941: Pull complete
-Digest: sha256:3dcdb92d7432d56604d4545cbd324b14e647b313626d99b889d0626de158f73a
-Status: Downloaded newer image for alpine:latest
-uid=0(root) gid=0(root) groups=0(root),1(bin),2(daemon),3(sys),4(adm),6(disk),10(wheel),11(floppy),20(dialout),26(tape),27(video)
-
+   latest: Pulling from library/alpine
+   e110a4a17941: Pull complete
+   Digest: sha256:3dcdb92d7432d56604d4545cbd324b14e647b313626d99b889d0626de158f73a
+   Status: Downloaded newer image for alpine:latest
+   uid=0(root) gid=0(root) groups=0(root),1(bin),2(daemon),3(sys),4(adm),6(disk),10(wheel),11(floppy),20(dialout),26(tape),27(video)
    ```
 
   The last line of the output above shows that the container is running as root - `uid=0(root)` and `gid=0(root)`.
@@ -186,7 +184,6 @@ In this step you'll see how to implement user namespaces.
 
    rm: remove 'sh'? y
    rm: can't remove 'sh': Permission denied
-
    ```
 
   The operation fails with a permission denied error. This is because the file you are trying to delete exists in the local filesystem of the Docker Host and the container does not have root access outside of the namespace that it exists in.