fix for PLOT - just call sphinx_plot

Author: dimpase

src/sage/matrix/operation_table.py

@@ -981,19 +981,11 @@ def color_table(self, element_names=True, cmap=gist_rainbow_copy, **options):
             sage: OT.color_table()
             Graphics object consisting of 37 graphics primitives
 
-        
         .. PLOT::
-            import matplotlib.pyplot as plt
+
             from sage.matrix.operation_table import OperationTable
-            from sage.all import SymmetricGroup, operator
             OT = OperationTable(SymmetricGroup(3), operation=operator.mul)
-            fig = OT.color_table().matplotlib()
-            managed_fig=plt.figure()
-            canvas_manager = managed_fig.canvas.manager
-            canvas_manager.canvas.figure=fig
-            fig.set_canvas(canvas_manager.canvas)
-            plt.show()
-
+            sphinx_plot(OT.color_table())
         """
 
         # Base matrix plot object, without text