Update upgrade.md (#3042)

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Wang Jie 2017-04-26 04:56:25 +08:00 committed by John Mulhausen
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@ -8,7 +8,7 @@ Upgrade the UCP components on this node
## Description
This commands upgrades the UCP running on this node.
This command upgrades the UCP running on this node.
To upgrade UCP:
* Upgrade the Docker Engine in all nodes (optional)