docs: update transitions tutorial

[dummdidumm]

fixes #8820

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[dummdidumm]

I don't get it - why is the redirect working for me locally but not on the preview deployment? What's going on there?

[gtm-nayan]

If you're getting a 500/404 then try removing the trailing slash.

[dummdidumm]

ah lol it's because all this is prerendered 😄