Backport PR #24032 on branch v3.6.0-doc (Reword SpanSelector example.)#24034

QuLogic merged 1 commit intomatplotlib:v3.6.0-docmatplotlib/matplotlib:v3.6.0-docfrom

meeseeksmachine:auto-backport-of-pr-24032-on-v3.6.0-docmeeseeksmachine/matplotlib:auto-backport-of-pr-24032-on-v3.6.0-docCopy head branch name to clipboard