Incorrectly states in tutorials train_controlnet

[MaybeRichard]

Fixes # .

Description

The current documentation incorrectly states that "fold 0 is used for training" in the prepare_maisi_controlnet_json_dataloader function. In reality, the function uses the fold parameter to determine the validation set based on matching fold indices. Specifically, if a dataset item's fold value matches the fold value specified in config_maisi_controlnet_train.json, it is assigned to the validation set; otherwise, it is used for training.

Changes

• Updated Documentation:
  • Revised the description of the fold parameter to accurately reflect its functionality.
  • Clarified that in the current parameter settings, fold 0 is designated for validation and fold 1 is designated for training.

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[KumoLiu]

Thanks for the fix, LGTM.