Help include for NuRec command

Get Help

To view all available arguments for training, validation, and export utilities, run the following:

docker run --shm-size=64g --rm --gpus all \
  -e NGC_API_KEY=${NGC_API_KEY} \
  nvcr.io/nvidia/nre/nre-ga:26.04 --help

To get help for a specific export utility:

docker run --shm-size=64g --rm --gpus all \
  -e NGC_API_KEY=${NGC_API_KEY} \
  nvcr.io/nvidia/nre/nre-ga:26.04 \
  <EXPORT_UTILITY_NAME> \
  --help