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Update services.md 

Tasks, not services are scheduled on nodes.
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@ -664,7 +664,7 @@ For more information on constraints, refer to the `docker service create`
#### Placement preferences
While [placement constraints](#placement-constraints) limit the nodes a service
can run on, _placement preferences_ try to place services on appropriate nodes
can run on, _placement preferences_ try to place tasks on appropriate nodes
in an algorithmic way (currently, only spread evenly). For instance, if you
assign each node a `rack` label, you can set a placement preference to spread
the service evenly across nodes with the `rack` label, by value. This way, if