Fix warning admonition

Closes #138 (closed)

Fixes the warning under https://teklia.gitlab.io/atr/dan/usage/train/parameters/#dataset-parameters

docs/usage/train/parameters.md

@@ -16,8 +16,7 @@ All hyperparameters are specified and editable in the training scripts `dan/ocr/
 | `dataset_params.config.augmentation`   | Whether to use data augmentation on the training set.                                  | `bool` | `True` (see [dedicated section](#data-augmentation)) |
 
 !!! warning
-
-The variables `dataset_name`, `dataset_level`, `dataset_variant` and `dataset_path` must have values such that the data is located in `{dataset_path}/{dataset_name}_{dataset_level}{dataset_variant}`.
+    The variables `dataset_name`, `dataset_level`, `dataset_variant` and `dataset_path` must have values such that the data is located in `{dataset_path}/{dataset_name}_{dataset_level}{dataset_variant}`.
 
 ### Data preprocessing