Update docstring

Co-authored-by: Jasper Craeghs <[email protected]>

mlx/coverity/coverity_services.py

@@ -247,8 +247,9 @@ def assemble_query_filter(self, column_name, filter_values, matcher_type):
         }
 
     def get_defects(self, stream, filters, column_names, snapshot):
-        """Gets a list of defects for given stream, snapshot ID, filters and column names.
-        If the snapshot is empty, the last snapshot is taken.
+        """Gets a list of defects for the given stream, filters and column names.
+
+        If no snapshot ID is given, the last snapshot is taken.
         If a column name does not match the name of the `columns` property, the column can not be obtained because
         it need the correct corresponding column key.
         Column key `cid` is always obtained to use later in other functions.