Update documentation for EXPOSE

The documentation for EXPOSE seems to indicate, that EXPOSE is only relevant in the context of links, which is not the case.
can you please reformat the `Note` section like:

```
> **Note:**
> `EXPOSE` doesn't define which ports can be exposed to the host or make ports
> accessible from the host by default. To expose ports to the host, at run time,
> [use the `-p` flag](/userguide/dockerlinks) or
> [the -P flag](/reference/run/#expose-incoming-ports).
```