Update "hello-world" description

hello-world/content.md

@@ -1,13 +1,13 @@
 # Example output
 
 	$ docker run hello-world
+	
 	Hello from Docker.
 	This message shows that your installation appears to be working correctly.
 	
 	To generate this message, Docker took the following steps:
 	 1. The Docker client contacted the Docker daemon.
 	 2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
-	    (Assuming it was not already locally available.)
 	 3. The Docker daemon created a new container from that image which runs the
 	    executable that produces the output you are currently reading.
 	 4. The Docker daemon streamed that output to the Docker client, which sent it
@@ -16,12 +16,16 @@
 	To try something more ambitious, you can run an Ubuntu container with:
 	 $ docker run -it ubuntu bash
 	
+	Share images, automate workflows, and more with a free Docker Hub account:
+	 https://hub.docker.com
+	
 	For more examples and ideas, visit:
-	 http://docs.docker.com/userguide/
+	 https://docs.docker.com/userguide/
+	
 	
 	$ docker images hello-world
 	REPOSITORY   TAG     IMAGE ID      VIRTUAL SIZE
-	hello-world  latest  91c95931e552  910 B
+	hello-world  latest  af340544ed62  960 B
 
 %%LOGO%%