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Let's be more targeted then: Instead of a general comment on backends, add the following below the plot code:
If no plot shows up, please check [Toubleshooting].
which may link to https://matplotlib.org/devdocs/faq/troubleshooting_faq.html and should get a section on "my plot does show".
That's probably worth a second PR, because a really helpful guide to "it doesn't work" needs some care.
Originally posted by @timhoffm in #21335 (comment)