[#333] Updating docs with new topic names.
Description
Searched for the following old topic/frame names:
lgsvl_odom
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imu_raw
(no namespace) test_velodyne_node_cloud_front
base_link_rear
Notes for Reviewer
Closes #333 (closed). There was only one instance that I could find of any of the old topic names.
Checklist
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Documentation was updated
Edited by Joshua Whitley