Fix widget naming

Author: dstansby

docs/guide/third_party.rst

@@ -30,9 +30,9 @@ Here's a short example:
 
 The following properties and methods are useful for working with the figure and any axes within the widget:
 
-- `~.MPLWidget.figure` provides access to the figure
-- :meth:`~.MPLWidget.add_single_axes` adds a single axes to the figure, which can be accessed using the ``.axes`` attribute.
-- :meth:`~.MPLWidget.apply_napari_colorscheme` can be used to apply the napari colorscheme to any Axes you setup manually on the figure.
+- `~.BaseNapariMPLWidget.figure` provides access to the figure
+- :meth:`~.BaseNapariMPLWidget.add_single_axes` adds a single axes to the figure, which can be accessed using the ``.axes`` attribute.
+- :meth:`~.BaseNapariMPLWidget.apply_napari_colorscheme` can be used to apply the napari colorscheme to any Axes you setup manually on the figure.
 
 Working with napari layers
 --------------------------

src/napari_matplotlib/base.py

@@ -129,7 +129,7 @@ class NapariMPLWidget(BaseNapariMPLWidget):
 
     See Also
     --------
-    MPLWidget : The parent class of this widget. Contains helpful methods
+    BaseNapariMPLWidget : The parent class of this widget. Contains helpful methods
         for creating and working with the Matplotlib figure and any axes.
     """