clarifying kubectl prereq wording (kubernetes#9156)

* simplifying the kubectl prereqs

* unforeseen spelling fix

* made readability corrections

* minor phrasing change

Author: jimangel

content/en/docs/tasks/tools/install-kubectl.md

@@ -12,7 +12,7 @@ Use the Kubernetes command-line tool, [kubectl](/docs/user-guide/kubectl/), to d
 {{% /capture %}}
 
 {{% capture prerequisites %}}
-Use a version of kubectl that is the same version as your server or later. Using an older kubectl with a newer server might produce validation errors.
+You must use a kubectl version that is the same, or later, as the version of your cluster. Using the latest version of kubectl helps avoid unforeseen issues.
 {{% /capture %}}