Fix collapsible sections

test_data/DATA_DESCRIPTION.md

@@ -4,17 +4,12 @@ The test data is organised under subdirectories that match the tested modules in
 
 ### Test data for `ethology.annotations`
 
-
-#### `medium_bboxes_dataset_VIA`
-
 <details>
-<summary>A medium size bounding boxes dataset in VIA format.</summary>
-
-
-| File name | Type | Format | N annotations | N images | Comments |
-| --- | --- | --- | --- | --- | --- |
-| `VIA_JSON_sample_1.json` | bboxes | VIA | 4440 | 50 | Category ID is a string ("crab"). |
-| `VIA_JSON_sample_2.json` | bboxes | VIA | 3977 | 50 | Category ID is a string ("crab").|
+    <summary> `medium_bboxes_dataset_VIA` A medium size bounding boxes dataset in VIA format.</summary>
+    | File name | Type | Format | N annotations | N images | Comments |
+    | --- | --- | --- | --- | --- | --- |
+    | `VIA_JSON_sample_1.json` | bboxes | VIA | 4440 | 50 | Category ID is a string ("crab"). |
+    | `VIA_JSON_sample_2.json` | bboxes | VIA | 3977 | 50 | Category ID is a string ("crab").|
 </details>
 
 #### `medium_bboxes_dataset_COCO`