Introduce docstyle D301

Based on !2281 (merged)

This rule encourages using actual line breaks.

arkindex/documents/api/entities.py

@@ -521,8 +521,10 @@ class CorpusEntities(CorpusACLMixin, ListAPIView):
 
 @extend_schema_view(get=extend_schema(operation_id="ListElementLinks", tags=["entities"]))
 class ElementLinks(CorpusACLMixin, ListAPIView):
-    """
-    List all links where parent and child are linked to the element.\n\n
+    r"""
+    List all links where parent and child are linked to the element.
+
+
     Requires a **guest** access to the element corpus
     """
     serializer_class = EntityLinkSerializer