JS: Correct discovery URL for observe example
JS: Correct discovery URL for observe example

zqzhang/iotivity-node,zolkis/iotivity-node,zolkis/iotivity-node,zolkis/iotivity-node,zqzhang/iotivity-node,zqzhang/iotivity-node,zolkis/iotivity-node,zqzhang/iotivity-node,zolkis/iotivity-node,zqzhang/iotivity-node