Simplify the vision service code sample (#623)

Author: bhaney

examples/apis.json

@@ -19,9 +19,5 @@
   "pose_tracker": { "func": "get_poses" },
   "power_sensor": { "func": "get_power" },
   "motion": { "func": "get_pose" },
-  "vision": {
-    "func": "get_classifications_from_camera",
-    "args": ["YOURCAMERANAME", "1"],
-    "comment": "Note that the Camera supplied is a placeholder. Please change this to a valid Camera. Also note that the get_classifications method is a placeholder and is commented out to give you a choice to use get_detections method instead if you are doing detections."
-  }
+  "vision": { "func": "get_properties" }
 }