Add doc for _surveillance_flags sample_sets param

Author: leehart

malariagen_data/anoph/sample_metadata.py

@@ -405,6 +405,9 @@ def _parse_surveillance_flags(
         summary="""
             Access surveillance flags for one or more sample sets.
         """,
+        parameters=dict(
+            sample_sets="List of sample sets.",
+        ),
         returns="""A pandas DataFrame, one row per sample. The columns are:
         `sample_id` is the identifier of the sample,
         `is_surveillance` indicates whether the sample can be used for surveillance,