fix formatting in container-communication.md

fix formatting in container-communication.md so page is rendered perfectly at https://docs.docker.com/engine/userguide/networking/default_network/container-communication/
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vishesh92 2016-10-10 17:58:48 +05:30 committed by GitHub
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@ -29,6 +29,7 @@ Docker will go set `ip_forward` to `1` for you when the server starts up. If you
set `--ip-forward=false` and your system's kernel has it enabled, the
`--ip-forward=false` option has no effect. To check the setting on your kernel
or to turn it on manually:
```
$ sysctl net.ipv4.conf.all.forwarding