fixup! KEP-3221: update kep

Signed-off-by: Nabarun Pal <[email protected]>

Author: palnabarun

keps/sig-auth/3221-structured-authorization-configuration/README.md

@@ -350,9 +350,12 @@ This will be incremented on round-trip of an authorizer. It will track total
 authorization decision invocations across the following labels.
 
 Labels {along with possible values}:
-- `mode` {RBAC, Node, Webhook}
+- `mode` {<authorizer_name>}
 - `decision` {Allow, Deny, NoOpinion}
 
+**Note:** Some examples of <authorizer_name>: `RBAC`, `Node`, `ABAC`, `webhook{,_<name>}`.
+If there is only one webhook, there would be no `_<name>` suffix.
+
 2. `apiserver_authorization_step_webhook_invocations_total`
 
 This will be incremented on round-trip of an authorization webhook. It will track