Fix example in doc-string

Author: basnijholt

src/graphviz_anywidget/__init__.py

@@ -16,7 +16,7 @@ class GraphvizWidget(anywidget.AnyWidget):
     Example:
     -------
     >>> dot_string = "digraph { a -> b; b -> c; c -> a; }"
-    >>> pipe_func_graph_widget = PipeFuncGraphWidget(dot_source=dot_string)
+    >>> pipe_func_graph_widget = GraphvizWidget(dot_source=dot_string)
     >>> pipe_func_graph_widget
 
     """