Fix formatting

Author: Joshua Stevenson

lib/matplotlib/widgets.py

@@ -2857,9 +2857,9 @@ def _snap(values, snap_values):
     def extents(self):
         """
         (float, float)
-            The values, in data coordinates, for the start and end points of the current selection.
-            If there is no selection then the start and end values will be the same.
-            Writable.
+            The values, in data coordinates, for the start and end points of the current
+            selection. If there is no selection then the start and end values will be
+            the same. Writable.
         """
         if self.direction == 'horizontal':
             vmin = self._selection_artist.get_x()