Issue in file security/cert_manager_operator/cert-manager-operator-issuer-acme.adoc

In the prerequisites we direct the user to follow upstream documentation for creating the service principle but we should also show an example of using the Cloud Credential Operator's CredentialRequest.

apiVersion: cloudcredential.openshift.io/v1
kind: CredentialsRequest
metadata:
  name: cert-manager-azure
  namespace: openshift-cloud-credential-operator
spec:
  providerSpec:
    apiVersion: cloudcredential.openshift.io/v1
    kind: AzureProviderSpec
    roleBindings:
      - role: "DNS Zone Contributor"
        scope: example.com
  secretRef:
    name: cert-manager-azure
    namespace: cert-manager
  serviceAccountNames:
    - cert-manager 

apiVersion: cert-manager.io/v1
kind: ClusterIssuer
metadata:
  name: letsencrypt
spec:
  acme:
    email: user@example.com
    privateKeySecretRef:
      name: letsencrypt-account-key
    server: https://acme-v02.api.letsencrypt.org/directory
    solvers:
      - dns01:
          azureDNS:
            clientID: <from cert-manager-azure secret key client_id>
            clientSecretSecretRef:
              name: cert-manager-azure
              key: azure_client_secret
            subscriptionID: <from cert-manager-azure secret key azure_subscription_id>
            tenantID: <from cert-manager-azure secret key azure_tenant_id>
            resourceGroupName: example-resourcegroup
            hostedZoneName: example.com
            # Azure Cloud Environment, default to AzurePublicCloud
            environment: AzurePublicCloud