Fix example in cmdline help text to have correct output
Showing "$$ exit 13" caught my eye and wasn't correct.
While in there I also made it so the following paragraph didn't go past 80 chars
@@ -86,17 +86,18 @@ and linking containers.
## Examples
$ docker run --name test -it debian
- $$ exit 13
- exit
+ root@d6c0fe130dba:/# exit 13
$ echo $?
13
$ docker ps -a | grep test
- 275c44472aeb debian:7 "/bin/bash" 26 seconds ago Exited (13) 17 seconds ago test
-
-In this example, we are running `bash` interactively in the `debian:latest` image, and giving
-the container the name `test`. We then quit `bash` by running `exit 13`, which means `bash`
-will have an exit code of `13`. This is then passed on to the caller of `docker run`, and
-is recorded in the `test` container metadata.
+ d6c0fe130dba debian:7 "/bin/bash" 26 seconds ago Exited (13) 17 seconds ago test
+
+This example runs a container named `test` using the `debian:latest`
+image. The `-it` instructs Docker to allocate a pseudo-TTY connected to
+the container's stdin; creating an interactive `bash` shell in the container.
+In the example, the `bash` shell is quit by entering
+`exit 13`. This exit code is passed on to the caller of
+`docker run`, and is recorded in the `test` container's metadata.
$ docker run --cidfile /tmp/docker_test.cid ubuntu echo "test"
