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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

Signed-off-by: Doug Davis <dug@us.ibm.com>

Doug Davis authored on 2015/07/06 20:53:50
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@@ -86,17 +86,18 @@ and linking containers.
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 ## Examples
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     $ docker run --name test -it debian
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-    $$ exit 13
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-    exit
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+    root@d6c0fe130dba:/# exit 13
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     $ echo $?
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     13
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     $ docker ps -a | grep test
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-    275c44472aeb        debian:7            "/bin/bash"         26 seconds ago      Exited (13) 17 seconds ago                         test
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-
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-In this example, we are running `bash` interactively in the `debian:latest` image, and giving
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-the container the name `test`. We then quit `bash` by running `exit 13`, which means `bash`
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-will have an exit code of `13`. This is then passed on to the caller of `docker run`, and
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-is recorded in the `test` container metadata.
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+    d6c0fe130dba        debian:7            "/bin/bash"         26 seconds ago      Exited (13) 17 seconds ago                         test
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+
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+This example runs a container named `test` using the `debian:latest` 
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+image. The `-it` instructs Docker to allocate a pseudo-TTY connected to
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+the container's stdin; creating an interactive `bash` shell in the container.
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+In the example, the `bash` shell is quit by entering
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+`exit 13`. This exit code is passed on to the caller of
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+`docker run`, and is recorded in the `test` container's metadata.
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     $ docker run --cidfile /tmp/docker_test.cid ubuntu echo "test"
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