[openstreetmap/openstreetmap-website] Update en.yml to mention how to unsubscribe (PR #4505)

[Anton Khorev]

I guess it should be a page like this one

![image](https://github.com/openstreetmap/openstreetmap-website/assets/4158490/eaafe8bf-81fc-422c-bf06-7489454ff122)

when `/user/*/diary/*/unsubscribe` is opened with GET.

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