docs: clarify optional kubectl certificate verification

Signed-off-by: Taylor Mutch <taylormutch@gmail.com>

Author: TaylorMutch

docs/kubernetes/managing-certificates.mdx

@@ -141,8 +141,9 @@ for the authorization and trust boundary.
 
 ### Verify the certificate
 
-Export the certificate, key, and server trust bundle to test operator
-authentication:
+If you have `kubectl` access and want to verify that the certificate
+authenticates correctly, use the following example. Export the certificate,
+key, and server trust bundle:
 
 ```shell
 umask 077