Address review comments

Signed-off-by: Nabarun Pal <pal.nabarun95@gmail.com>

Author: palnabarun

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

@@ -88,8 +88,8 @@ is unreachable.
 - Define a configuration file format for configuring Kubernetes API Server
 Authorization chain.
 - Allow ordered definition of authorization modes.
-- Allow definition of multiple webhooks in the authorization chain while all 
-other types of authorizers should only be specified once. 
+- Allow definition of multiple webhooks in the authorization chain while all
+other types of authorizers should only be specified once.
 - Allow resource/user based pre-filtering of webhooks using CEL to prevent unnecessary
 invocations.
 - Enable user to define the policy when a webhook can't be reached due to
@@ -354,7 +354,7 @@ authorizers:
       #   - NoOpinion: continue to subsequent authorizers to see if one of
       #     them allows the request
       #   - Deny: reject the request without consulting subsequent authorizers
-      # Default: NoOpinion
+      # Required, with no default.
       failurePolicy: Deny
       connectionInfo:
         # Controls how the webhook should communicate with the server.
@@ -446,8 +446,8 @@ Labels {along with possible values}:
 
 **Note:** Some examples of <authorizer_name>: `RBAC`, `Node`, `ABAC`, `webhook{,_<name>}`.
 If there is only one webhook and no name specified, there would be no `_<name>` suffix.
-If the webhook has a named specified, even if there is only one webhook, then the name
-should be in the metrics and exposed via the metrics endpoint.
+If the webhook has a name specified, even if there is only one webhook, then the name
+would be in the metrics and exposed via the metrics endpoint.
 
 2. `apiserver_authorization_webhook_evaluations_total`
 
@@ -756,6 +756,10 @@ the small impact will be measured and rationalized to keep the addition
 minimal. The addition would be well within the scalability limits and
 thresholds.
 
+For use-cases where the CEL filters would pre-filter requests even before the need to
+be dispatched to a webhook, there would be a performance improvement due to lower
+number of network calls.
+
 ### Troubleshooting
 
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