Draft: Resolve #184 "update user guide / website"

Closes #184

docs/userguide/plotter.rst

@@ -142,10 +142,10 @@ One method to evaluate the trained ML model ist to compare the model predictions
 
 .. code-block:: python
 
-    plotter.attributes_obs_vs_pred(block="inputML", attributes=["x1"], datamodule=datamodule)
+    plotter.attributes_obs_vs_pred(block="inputML", datamodule=datamodule)
 
 
-.. image:: ../_images/plotter_3_obsvspred.png
+.. image:: ../_images/gettingstarted_7_45degreeplot_x.png
    :alt: The image cannot be displayed.
    :align: center
    :width: 600