Fix language in space_robots README (issue #156)

Author: eholum

space_robots/README.md

@@ -8,9 +8,10 @@ This is for Curiosity Mars rover and Canadarm demos.
 
 ## Building the Demo Docker
 
-The demo image builds on top of the `spaceros` base image the local `moveit2` image.
-To build the docker image, first ensure the `spaceros` base image is available either by building it locally or pulling it,
-then build the `moveit2` and the `space_robots` demo image:
+The demo image builds on top of the `spaceros` and `moveit2` images.
+To build the docker image, first ensure the `spaceros` base image is available either by [building it locally](https://github.com/space-ros/space-ros) or pulling it.
+
+Then build the `moveit2` and the `space_robots` demo images:
 
 ```bash
 cd ../moveit2