Merge pull request matplotlib#20378 from anntzer/cd

Redirect agg_buffer{,_to_array} examples to canvasagg.

Author: timhoffm

examples/misc/agg_buffer.py

@@ -20,6 +20,8 @@
 any format supported by Pillow.
 
 .. _Pillow: https://pillow.readthedocs.io/
+.. redirect-from:: /gallery/misc/agg_buffer
+.. redirect-from:: /gallery/misc/agg_buffer_to_array
 """
 
 from matplotlib.backends.backend_agg import FigureCanvasAgg