Make code samples more consistent

src/viam/components/camera/camera.py

@@ -107,6 +107,8 @@ async def get_point_cloud(
             import numpy as np
             import open3d as o3d
 
+            my_camera = Camera.from_robot(robot=machine, name="my_camera")
+
             data, _ = await my_camera.get_point_cloud()
 
             # write the point cloud into a temporary file

src/viam/components/input/input.py

@@ -274,6 +274,8 @@ async def trigger_event(
         """Directly send an Event (such as a button press) from external code
 
         ::
+            my_controller = Controller.from_robot(
+                robot=machine, name="my_controller")
 
             # Define a "Button is Pressed" event for the control BUTTON_START.
             button_is_pressed_event = Event(

src/viam/services/motion/motion.py

@@ -238,6 +238,8 @@ async def stop_plan(
 
         ::
 
+            motion = MotionClient.from_robot(robot=machine, name="builtin")
+
             # Assuming a `move_on_globe()` started the execution
             # Stop the base component which was instructed to move by `move_on_globe()`
             # or `move_on_map()`