x/pkgsite: package level examples do not render consistently with vN in path

[kortschak]

What is the URL of the page with the issue?

https://pkg.go.dev/periph.io/x/devices/v3/epd#example-package (cf. https://pkg.go.dev/periph.io/x/devices/epd#example-package currently at v3)

What is your user agent?

Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:86.0) Gecko/20100101 Firefox/86.0

Screenshot

pkg.go.dev/periph.io/x/devices/v3/epd

pkg.go.dev/periph.io/x/devices/epd

What did you do?

Navigate to links above and compare the rendering of the example.

What did you expect to see?

The same rendering.

What did you see instead?

The example on the v3 page does not use the same package main constructed rendering.