Add a missing word to clarify our policy for when to upgrade (#2212)

Kubernetes versions.

site/content/en/docs/Installation/_index.md

@@ -23,7 +23,7 @@ description: >
 
 {{< alert title="Warning" color="warning">}}
 Later versions of Kubernetes may work, but this project is tested against {{% k8s-version %}}, and is therefore the supported version.
-Agones will update its support to n-1 version of what is available across the majority of major cloud providers - GKE, EKS and
+Agones will update its support to the n-1 version of what is available across the majority of major cloud providers - GKE, EKS and
 AKS, while also ensuring that all Cloud providers can support that version.
 {{< /alert >}}