Complete details regarding CSR garbage collection

Signed-off-by: Monis Khan <mok@vmware.com>

content/en/docs/reference/access-authn-authz/certificate-signing-requests.md

@@ -3,6 +3,7 @@ reviewers:
 - liggitt
 - mikedanese
 - munnerz
+- enj
 title: Certificate Signing Requests
 content_type: concept
 weight: 20
@@ -56,7 +57,9 @@ state for some duration:
 
 * Approved requests: automatically deleted after 1 hour
 * Denied requests: automatically deleted after 1 hour
+* Failed requests: automatically deleted after 1 hour
 * Pending requests: automatically deleted after 24 hours
+* All requests: automatically deleted after the issued certificate has expired
 
 ## Signers
 
@@ -78,7 +81,7 @@ that case, the documentation for the signer should specify the meaning of
 additional certificates; for example, this might be the certificate plus
 intermediates to be presented during TLS handshakes.
 
-The PKCS#10 signing request format doesn't allow to specify a certificate
+The PKCS#10 signing request format does not allow to specify a certificate
 expiration or lifetime. The expiration or lifetime therefore has to be set
 through e.g. an annotation on the CSR object. While it's theoretically
 possible for a signer to use that expiration date, there is currently no
@@ -185,8 +188,7 @@ To allow signing a CertificateSigningRequest:
 
 A few steps are required in order to get a normal user to be able to
 authenticate and invoke an API. First, this user must have certificate issued
-by the Kubernetes cluster, and then present that Certificate to the API call
-as the Certificate Header or through the kubectl.
+by the Kubernetes cluster, and then present that certificate to the Kubernetes API.
 
 ### Create private key
 
@@ -211,8 +213,6 @@ kind: CertificateSigningRequest
 metadata:
   name: myuser
 spec:
-  groups:
-  - system:authenticated
   request: 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
   signerName: kubernetes.io/kube-apiserver-client
   usages: