add note on input format to auto_runner

Author: DanielNobbe

monai/apps/auto3dseg/auto_runner.py

@@ -194,6 +194,13 @@ class AutoRunner:
             ├── segresnet2d_0       # network scripts/configs/checkpoints and pickle object of the algo
             └── swinunetr_0         # network scripts/configs/checkpoints and pickle object of the algo
 
+    Notes: 
+        The input config requires at least the following keys:
+        - ``modality``: the modality of the data, e.g. "ct", "mri", etc.
+        - ``datalist``: the path to the datalist file in JSON format.
+        - ``dataroot``: the root directory of the data files.
+
+        For the datalist file format, see the description under monai.data.decathlon_datalist.load_decathlon_datalist.
     """
 
     analyze_params: dict | None