Fix copy & paste error in docstring.

IPython/html/widgets/widget_bool.py

@@ -31,4 +31,4 @@ class CheckboxWidget(_BoolWidget):
 
 class ToggleButtonWidget(_BoolWidget):
     _view_name = Unicode('ToggleButtonView', sync=True)
-    
+    

IPython/html/widgets/widget_image.py

@@ -1,7 +1,6 @@
-"""ButtonWidget class.  
+"""ImageWidget class.  
 
-Represents a button in the frontend using a widget.  Allows user to listen for
-click events on the button and trigger backend code when the clicks are fired.
+Represents an image in the frontend using a widget.
 """
 #-----------------------------------------------------------------------------
 # Copyright (c) 2013, the IPython Development Team.
@@ -33,4 +32,4 @@ class ImageWidget(DOMWidget):
     
     value = Bytes()
     def _value_changed(self, name, old, new):
-        self._b64value = base64.b64encode(new)
+        self._b64value = base64.b64encode(new)