Fix typos in Kubernetes Cluster Autoscaler overview dashboard

[trevdem]

Summary

The Kubernetes Cluster Autoscaler overview dashboard (kubernetes_cluster_autoscaler/assets/dashboards/kubernetes_cluster_autoscaler_overview.json) contains misspellings in the dashboard description.

Typos

Location	Current text	Suggested fix
Dashboard description	dashbaord	dashboard
Dashboard description	downsacaling	downscaling

Impact

These typos are visible to users in the shipped Kubernetes Cluster Autoscaler dashboard template.