text: Title: [Doc][Dashboard] Add Documentation about TPU Logs
  Body: ### Description
  
  Tracking issue to add documentation about libtpu logs written to `/tmp/tpu_logs` and how they're exposed on the Ray dashboard.
  
  ### Link
  
  Related PR: https://github.com/ray-project/ray/pull/47737
  
  The documentation should be added to the general TPU docs (https://docs.ray.io/en/latest/cluster/kubernetes/user-guides/tpu.html) and referenced from the docs on logging (https://docs.ray.io/en/latest/ray-observability/getting-started.html#logs-view)