Made a modification to the docstring for 'calculate_statistics'.

toarstats/interface.py

@@ -22,7 +22,7 @@ def calculate_statistics(
 
     This function is the public interface for the ``toarstats`` package.
     It takes all the user inputs and returns the result of all requested
-    statistics.
+    statistics and metrics.
 
     :param sampling: temporal aggregation, one of ``daily``,
                      ``monthly``, ``seasonal``, ``vegseason``,