Update index.md

Author: noctarius

docs/important-notes/index.md

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 Simplyblock is a high-performance yet reliable distributed block storage optimized for Kubernetes that is compatible with any bare
-metal and virtualized Linux environments. It also provides integrations with other environments, such as Oroxmox.
+metal and virtualized Linux environments. It also provides integrations with other environments, such as Proxmox.
 
 To enable the successful operation of your new simplyblock cluster, this section defines some initial conventions and
 terminology when working with this documentation.