swap busybox for ubuntu, its quicker..

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@home.org.au> (github: SvenDowideit)

docs/sources/examples/hello_world.rst

@@ -4,9 +4,6 @@
 
 .. _examples:
 
-Hello World
------------
-
 .. _running_examples:
 
 Check your Docker install
@@ -18,7 +15,7 @@ your Docker install, run the following command:
 .. code-block:: bash
 
     # Check that you have a working install
-    docker info
+    $ sudo docker info
 
 If you get ``docker: command not found`` or something like
 ``/var/lib/docker/repositories: permission denied`` you may have an incomplete
@@ -30,27 +27,28 @@ Please refer to :ref:`installation_list` for installation instructions.
 .. _hello_world:
 
 Hello World
-===========
+-----------
 
 .. include:: example_header.inc
 
 This is the most basic example available for using Docker.
 
-Download the base image which is named ``ubuntu``:
+Download the small base image named ``busybox``:
 
 .. code-block:: bash
 
-    # Download an ubuntu image
-    sudo docker pull ubuntu
+    # Download an busybox image
+    $ sudo docker pull busybox
 
-Alternatively to the ``ubuntu`` image, you can select ``busybox``, a bare
-minimal Linux system. The images are retrieved from the Docker
-repository.
+The ``busybox`` image is a minimal Linux system. You can do the same
+with any number of other images, such as ``debian``, ``ubuntu`` or ``centos``.
+The images can be found and retrieved using the `Docker index`_.
 
+.. _Docker index: http://index.docker.io
 
 .. code-block:: bash
 
-    sudo docker run ubuntu /bin/echo hello world
+    $ sudo docker run busybox /bin/echo hello world
 
 This command will run a simple ``echo`` command, that will echo ``hello world`` back to the console over standard out.
 
@@ -58,7 +56,7 @@ This command will run a simple ``echo`` command, that will echo ``hello world``
 
 - **"sudo"** execute the following commands as user *root* 
 - **"docker run"** run a command in a new container 
-- **"ubuntu"** is the image we want to run the command inside of.
+- **"busybox"** is the image we are running the command in.
 - **"/bin/echo"** is the command we want to run in the container
 - **"hello world"** is the input for the echo command
 
@@ -82,7 +80,7 @@ See the example in action
 .. _hello_world_daemon:
 
 Hello World Daemon
-==================
+------------------
 
 .. include:: example_header.inc
 
@@ -172,14 +170,14 @@ See the example in action
            id=&quot;asciicast-2562&quot; async></script></body>">
    </iframe>
 
-The next example in the series is a :ref:`python_web_app` example, or
+The next example in the series is a :ref:`nodejs_web_app` example, or
 you could skip to any of the other examples:
 
 
-* :ref:`python_web_app`
 * :ref:`nodejs_web_app`
 * :ref:`running_redis_service`
 * :ref:`running_ssh_service`
 * :ref:`running_couchdb_service`
 * :ref:`postgresql_service`
 * :ref:`mongodb_image`
+* :ref:`python_web_app`