Update oidc certificate yaml

[Elisamara Aoki Gonçalves]

Brief Description
-----------------
The yaml shown in documentation for oidc-auth-apps-certificate.yaml is not correct for cert-manager.io/v1 API.

Severity
--------
<Minor: System/Feature is usable with minor issue>

Steps to Reproduce
------------------

"Set up OIDC Auth Applications", "Procedure", 1. a. A.
The content of oidc-auth-apps-certificate.yaml text box should be (verbatim):

~(keystone_admin)]$ cat <<EOF > oidc-auth-apps-certificate.yaml
---
apiVersion: cert-manager.io/v1
kind: Certificate
metadata:
  name: oidc-auth-apps-certificate
  namespace: kube-system
spec:
  secretName: oidc-auth-apps-certificate
  duration: 2160h # 90 days
  renewBefore: 360h # 15 days
  issuerRef:
    name: system-local-ca
    kind: ClusterIssuer
  commonName: <OAM_floating_IP_address>
  subject:
    organizations:
      - ABC-Company
    organizationalUnits:
      - StarlingX-system-oidc-auth-apps
  ipAddresses:
  - <OAM_floating_IP_address>
EOF

Expected Behavior
------------------
the kubectl apply command should work

Actual Behavior
----------------

The kubectl command responds as follows:

$ kubectl apply -f oidc-auth-apps-certificate.yaml.bk0
error: error validating "oidc-auth-apps-certificate.yaml.bk0": error validating data: [ValidationError(Certificate.spec): unknown field "organizationalUnits" in io.cert-manager.v1.Certificate.spec, ValidationError(Certificate.spec): unknown field "organizations" in io.cert-manager.v1.Certificate.spec]; if you choose to ignore these errors, turn validation off with --validate=false

Reproducibility
---------------
Yes

System Configuration
--------------------
Any. Demonstrated on AIO-SX

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/c/starlingx/docs/+/862749

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: r/stx.7.0
Review: https://review.opendev.org/c/starlingx/docs/+/863367

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/starlingx/docs/+/862749
Committed: https://opendev.org/starlingx/docs/commit/f57ff3fb992b60720fb77417d4fcb4695b59edff
Submitter: "Zuul (22348)"
Branch: master

commit f57ff3fb992b60720fb77417d4fcb4695b59edff
Author: Elisamara Aoki Goncalves <email address hidden>
Date: Wed Oct 26 16:02:13 2022 -0300

    Update oidc certificate yaml (r7,dsR7)

    Closes-bug: 1994888

    Signed-off-by: Elisamara Aoki Goncalves <email address hidden>
    Change-Id: I5018c5acc34ef478c5b768830e0f7ccd5594581d

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/starlingx/docs/+/863367
Committed: https://opendev.org/starlingx/docs/commit/c1d43dee70585fd5aeb01d4eb25516f0faf415b7
Submitter: "Zuul (22348)"
Branch: r/stx.7.0

commit c1d43dee70585fd5aeb01d4eb25516f0faf415b7
Author: Elisamara Aoki Goncalves <email address hidden>
Date: Wed Oct 26 16:02:13 2022 -0300

    Update oidc certificate yaml (r7,dsR7)

    Closes-bug: 1994888

    Signed-off-by: Elisamara Aoki Goncalves <email address hidden>
    Change-Id: I5018c5acc34ef478c5b768830e0f7ccd5594581d