Bug report

Just a placeholder for the discussion in #9530 including possible improvements to the colormap example.

# Paste your code here
#
#

Actual outcome

# If applicable, paste the console output here
#
#

Expected outcome

Matplotlib version

• Operating system:
• Matplotlib version:
• Matplotlib backend (print(matplotlib.get_backend())):
• Python version:
• Jupyter version (if applicable):
• Other libraries: