[enterprise-4.13] OBSDOCS-972: Logging- Remove confusing support statement for splunk fields deprecation

[openshift-cherrypick-robot]

This is an automated cherry-pick of #74643

/assign ShaunaDiaz

[openshift-ci-robot]

@openshift-cherrypick-robot: Ignoring requests to cherry-pick non-bug issues: OBSDOCS-972

In response to this:

This is an automated cherry-pick of #74643

/assign ShaunaDiaz

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[ocpdocs-previewbot]

🤖 Tue Apr 16 17:05:52 - Prow CI generated the docs preview:

https://74733--ocpdocs-pr.netlify.app/openshift-enterprise/latest/logging/logging_release_notes/logging-5-9-release-notes.html

[openshift-ci]

@openshift-cherrypick-robot: all tests passed!

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