- Fix the attach examples according to the new attach behavior

- Add the option of adding the user to docker's group and avoid the usage of "sudo" before each command

docs/sources/examples/hello_world.rst

@@ -127,10 +127,11 @@ Check the logs make sure it is working correctly.
 
     sudo docker attach $CONTAINER_ID
 
-Attach to the container to see the results in realtime.
+Attach to the container to see the results in real-time.
 
 - **"docker attach**" This will allow us to attach to a background
   process to see what is going on.
+- **"-sig-proxy=true" Proxify all received signal to the process (even in non-tty mode)
 - **$CONTAINER_ID** The Id of the container we want to attach too.
 
 Exit from the container attachment by pressing Control-C.

docs/sources/examples/python_web_app.rst

@@ -39,11 +39,12 @@ container. The ``BUILD_JOB`` environment variable will be set with the new conta
 
 .. code-block:: bash
 
-    sudo docker attach $BUILD_JOB
+    sudo docker attach -sig-proxy=false $BUILD_JOB
     [...]
 
 While this container is running, we can attach to the new container to
-see what is going on. You can use Ctrl-C to disconnect.
+see what is going on. The flag ``-sig-proxy`` set as ``false`` allows you to connect and
+disconnect (Ctrl-C) to it without stopping the container.
 
 .. code-block:: bash
 

docs/sources/examples/running_ssh_service.rst

@@ -21,7 +21,8 @@ smooth, but gives you a good idea.
    daemon is unprotected and available via a TCP port. When you run
    through the same steps in a newer version of Docker, you will
    need to add ``sudo`` in front of each ``docker`` command in order
-   to reach the daemon over its protected Unix socket.
+   to reach the daemon over its protected Unix socket or you can add
+   your user to docker's group: ``sudo usermod -a -G docker <user>``.
 
 .. raw:: html