Modify hierarchy in BioSample draft

Updated hierarchy to include 'Sample' and 'BioSample'.

Author: selgebali

pages/_types/BioSample/0.2-DRAFT.html

@@ -15,6 +15,10 @@
 hierarchy:
 - Thing
 - BioChemEntity
+hierarchy:
+- Thing
+- Sample
+- BioSample
 gh_tasks: https://github.com/Bioschemas/specifications/labels/type%3A%20Sample
 group: samples
 name: BioSample
@@ -683,4 +687,4 @@
      </tr>
       </tbody>
  </table>
- </div>
+ </div>