Update darts/timeseries.py

Co-authored-by: Dennis Bader <[email protected]>

darts/timeseries.py

@@ -4108,7 +4108,7 @@ def plot(
         default_formatting
             Whether to use the darts default scheme.
         title
-            The title of the plot.
+            Optionally, a custom plot title. If `None`, will use the name of the underlying `xarray.DataArray`.
         label
             Can either be a string or list of strings. If a string and the series only has a single component, it is
             used as the label for that component. If a string and the series has multiple components, it is used as