Clarify behaviour of restart policy in run ref doc
This clarifies that the behaviour of `unless-stopped` will restart the container on daemon start.  This was implied before, but now the restart-on-daemon-start behaviour is mentioned directly.
@@ -525,9 +525,9 @@ Docker supports the following restart policies:
<tr>
<td><strong>unless-stopped</strong></td>
<td>
- Always restart the container regardless of the exit status, but
- do not start it on daemon startup if the container has been put
- to a stopped state before.
+ Always restart the container regardless of the exit status,
+ including on daemon startup, except if the container was put
+ into a stopped state before the Docker daemon was stopped.
</td>
</tr>
</tbody>
