Update objectron.md

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The detection subgraph performs ML inference only once every few frames to The detection subgraph performs ML inference only once every few frames to
reduce computation load, and decodes the output tensor to a FrameAnnotation that reduce computation load, and decodes the output tensor to a FrameAnnotation that
contains nine keypoints: the 3D bounding box's center and its eight vertices. contains nine keypoints: the 3D bounding box's center and its eight vertices.
The tracking subgraph runs every frame, using the box traker in The tracking subgraph runs every frame, using the box tracker in
[MediaPipe Box Tracking](./box_tracking.md) to track the 2D box tightly [MediaPipe Box Tracking](./box_tracking.md) to track the 2D box tightly
enclosing the projection of the 3D bounding box, and lifts the tracked 2D enclosing the projection of the 3D bounding box, and lifts the tracked 2D
keypoints to 3D with keypoints to 3D with