replaced based off of with based on (docker#10684)

replaced based off of with based on

Author: ajay143444

get-started/swarm-deploy.md

@@ -36,7 +36,7 @@ services:
       - "8000:8080"
 ```
 
-In this Swarm YAML file, we have just one object: a `service`, describing a scalable group of identical containers. In this case, you'll get just one container (the default), and that container will be based off of your `bulletinboard:1.0` image created in [Part 2](part2.md) of the Quickstart tutorial. In addition, We've asked Swarm to forward all traffic arriving at port 8000 on our development machine to port 8080 inside our bulletin board container.
+In this Swarm YAML file, we have just one object: a `service`, describing a scalable group of identical containers. In this case, you'll get just one container (the default), and that container will be based on your `bulletinboard:1.0` image created in [Part 2](part2.md) of the Quickstart tutorial. In addition, We've asked Swarm to forward all traffic arriving at port 8000 on our development machine to port 8080 inside our bulletin board container.
 
 > **Kubernetes Services and Swarm Services are very different!** Despite the similar name, the two orchestrators mean very different things by the term 'service'. In Swarm, a service provides both scheduling _and_ networking facilities, creating containers and providing tools for routing traffic to them. In Kubernetes, scheduling and networking are handled separately: _deployments_ (or other controllers) handle the scheduling of containers as pods, while _services_ are responsible only for adding networking features to those pods.