[Containerization] Minor fixes

docs/Using-Docker.md

 ```
 docker run --mount type=bind,source="$(pwd)"/unity-volume,target=/unity-volume \
 	 <tag-name>:latest <environment-name> \
-	 --docker-target-name=unity-volume 
+	 --docker-target-name=unity-volume \
 	 --train --run-id=<run-id>
 ```
 
 ```
 docker run --mount type=bind,source="$(pwd)"/unity-volume,target=/unity-volume \
 	 balance.ball.v0.1:latest 3Dball \
-	 --docker-target-name=unity-volume 
+	 --docker-target-name=unity-volume \
 	 --train --run-id=<run-id>
 ```