Update docstring

Author: marthacryan

packages/python/plotly/plotly/missing_anywidget.py

@@ -3,9 +3,9 @@
 
 class FigureWidget(BaseFigure):
     """
-    FigureWidget stand-in for use when ipywidgets is not installed. The only purpose
+    FigureWidget stand-in for use when anywidget is not installed. The only purpose
     of this class is to provide something to import as
-    `plotly.graph_objs.FigureWidget` when ipywidgets is not installed. This class
+    `plotly.graph_objs.FigureWidget` when anywidget is not installed. This class
     simply raises an informative error message when the constructor is called
     """