Architecture page talks about two different seed clusters, but associated diagram shows same name for both

The dedicated seed cluster documentation at

- https://docs.kubermatic.com/kubermatic/v2.20/architecture/

explains the second image for dedicated seeds

- https://github.com/kubermatic/docs/blob/master/static/img/kubermatic/v2.20/architecture/dedicated-seeds.png

as an example for the `seed-us` and `seed-eu` clusters, yet both bounding boxes share the same headline *Seed Cluster Europe*.

It is suggested to

- [ ] Rename one of the two example seed clusters in the `dedicated-seeds.png` example to *Seed Cluster U.S. of A.*

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This was #797 before.

This could be solved together with #1113 in one row.

Open static/img/kubermatic/v2.20/architecture/dedicated-seeds.png and compare its two seed-cluster labels with the architecture page. Rename one label to “Seed Cluster U.S. of A.”, then check the rendered documentation image and consider the related work in issue #1113.

Written by the indexing model from the issue text.