update docstring

Author: christopher-wild

causal_testing/data_collection/data_collector.py

@@ -122,14 +122,15 @@ def run_system_with_input_configuration(self, input_configuration: dict) -> pd.D
 
 
 class ObservationalDataCollector(DataCollector):
-    """A data collector that extracts data that is relevant to the specified scenario from a csv of execution data."""
+    """A data collector that extracts data that is relevant to the specified scenario from a dataframe of execution
+    data."""
 
     def __init__(self, scenario: Scenario, data: pd.DataFrame):
         super().__init__(scenario)
         self.data = data
 
     def collect_data(self, **kwargs) -> pd.DataFrame:
-        """Read a csv containing execution data for the system-under-test into a pandas dataframe and filter to remove
+        """Read a pandas dataframe and filter to remove
         any data which is invalid for the scenario-under-test.
 
         Data is invalid if it does not meet the constraints outlined in the scenario-under-test (Scenario).