Copy edit and spaces for k8s_version description

Author: bbiggerr

openapi.yaml

@@ -6524,10 +6524,13 @@ paths:
                       <major>.<minor>. New and recycled Nodes in this cluster will be installed with the
                       latest available patch for the Cluster's Kubernetes version.
 
-                      When upgrading the Kubernetes version, only the next latest minor version can be deployed
-                      following the currently deployed version. For example, a cluster with Kubernetes version
-                      1.16 can be upgraded to version 1.17, but not directly to 1.18. The k8s_version can not be
-                      downgraded.
+
+                      When upgrading the Kubernetes version, only the next latest minor version following the current
+                      version can be deployed. For example, a cluster with Kubernetes version 1.16 can be upgraded to
+                      version 1.17, but not directly to 1.18.
+
+
+                      The Kubernetes version of a cluster can not be downgraded.
       responses:
         '200':
           description: Returns a single Kubernetes cluster.