storage/persistent-storage-nfs: Link to RHEL 9 docs

[travier]

See: #66588

Version(s):
4.13+

Issue:
#66588

Link to docs preview:

QE review:

• QE has approved this change.

Additional information:
N/A

[ocpdocs-previewbot]

🤖 Mon Jan 22 18:51:12 - Prow CI generated the docs preview: https://66589--ocpdocs-pr.netlify.app

[kalexand-rh]

@lpettyjo, will you PTAL at this PR?

[jldohmann]

LGTM! thanks 👍

[jldohmann]

/retest

[openshift-ci]

@travier: all tests passed!

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[jldohmann]

/cherrypick enterprise-4.15

[jldohmann]

/cherrypick enterprise-4.14

[jldohmann]

/cherrypick enterprise-4.13

[openshift-cherrypick-robot]

@jldohmann: new pull request created: #70657

In response to this:

/cherrypick enterprise-4.15

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[openshift-cherrypick-robot]

@jldohmann: new pull request created: #70658

In response to this:

/cherrypick enterprise-4.14

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[openshift-cherrypick-robot]

@jldohmann: new pull request created: #70659

In response to this:

/cherrypick enterprise-4.13

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.