Make it more newbie friendly

Added port map -p 8080:80 to a docker run command
Anded a link to localhost:8080
So there will be feedback

httpd/content.md

@@ -21,9 +21,11 @@ Then, run the commands to build and run the Docker image:
 
 ```console
 $ docker build -t my-apache2 .
-$ docker run -dit --name my-running-app my-apache2
+$ docker run -dit --name my-running-app -p 8080:80 my-apache2
 ```
 
+Visit http://localhost:8080 and you will see It works!
+
 ### Without a `Dockerfile`
 
 If you don't want to include a `Dockerfile` in your project, it is sufficient to do the following: