fix license link

swarm/README.md

@@ -73,7 +73,7 @@ Note that Swarm certificates must be generated with `extendedKeyUsage = clientAu
 
 # License
 
-View [license information](https://github.com/docker/swarm/blob/master/LICENSE) for the software contained in this image.
+View [license information](https://github.com/docker/swarm/blob/master/LICENSE.code) for the software contained in this image.
 
 # Supported Docker versions