Backport PR #21236: DOC: Update interactive colormap example#21268

timhoffm merged 1 commit intomatplotlib:v3.5.xmatplotlib/matplotlib:v3.5.xfrom

greglucas:manual-backport-of-pr-21236-on-v3.5.xgreglucas/matplotlib:manual-backport-of-pr-21236-on-v3.5.xCopy head branch name to clipboard