fix: missing docstring entry

adbnx_adapter/adapter.py

@@ -248,6 +248,7 @@ def networkx_to_arangodb(
  :type edge_definitions: List[adbnx_adapter.typings.Json]
  :param orphan_collections: A list of vertex collections that will be stored as
  orphans in the ArangoDB graph. Can be omitted if the graph already exists.
+ :type orphan_collections: List[str]
  :param keyify_nodes: If set to True, will create custom vertex keys based on the
  behavior of ADBNX_Controller._keyify_networkx_node(). Otherwise, ArangoDB
  _key values for vertices will range from 1 to N, where N is the number of