Modified the description to optimise marketplace search (#31)

* modified description to optimise search

* modified wording

* added the AKS keyword

Co-authored-by: Anirudh Raghunath <void@Anirudhs-MacBook-Pro.local>
Co-authored-by: Anirudh Raghunath <void@MININT-G1P7G69.fareast.corp.microsoft.com>

action.yml

@@ -1,5 +1,5 @@
 name: 'Deploy to Kubernetes cluster'
-description: 'Deploy to Kubernetes cluster'
+description: 'Deploy to a Kubernetes cluster including, but not limited to Azure Kubernetes Service (AKS) clusters'
 inputs: 
 # Please ensure you have used either azure/k8s-actions/aks-set-context or azure/k8s-actions/k8s-set-context in the workflow before this action
   namespace: