docker: update docker commands to conform to Docker 1.13 (#1505)

pages/common/docker.md

@@ -4,28 +4,28 @@
 
 - List currently running docker containers:
 
-`docker ps`
+`docker container ls`
 
 - List all docker containers (running and stopped):
 
-`docker ps -a`
+`docker container ls -a`
 
 - Start a container:
 
-`docker start {{container}}`
+`docker container start {{container}}`
 
 - Stop a container:
 
-`docker stop {{container}}`
+`docker container stop {{container}}`
 
 - Start a container from an image and get a shell inside of it:
 
-`docker run -it {{image}} bash`
+`docker container run -it {{image}} bash`
 
 - Run a command inside of an already running container:
 
-`docker exec {{container}} {{command}}`
+`docker container exec {{container}} {{command}}`
 
-- Remove a container:
+- Remove a stopped container:
 
-`docker rm {{container}}`
+`docker container rm {{container}}`