[doc] Akri section on 3.4 docs says tech-preview still

[e-minguez]

https://documentation.suse.com/suse-edge/3.4/html/edge/components-akri.html#id-how-does-suse-edge-use-akri

Akri was a Technology Preview offering in previous Edge releases and is now deprecated. Removal is planned for a future release.

https://documentation.suse.com/suse-edge/3.4/html/edge/id-release-notes.html#id-deprecated-features

We need to either remove the Akri section or make a big disclaimer saying this is deprecated now.