[enterprise-4.15] OBSDOCS-805: Add docs for content filtering

[openshift-cherrypick-robot]

This is an automated cherry-pick of #71434

/assign abrennan89

[openshift-ci-robot]

@openshift-cherrypick-robot: Ignoring requests to cherry-pick non-bug issues: OBSDOCS-805

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In response to this:

This is an automated cherry-pick of #71434

/assign abrennan89

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[ocpdocs-previewbot]

🤖 Tue Mar 12 20:08:20 - Prow CI generated the docs preview:
https://73021--ocpdocs-pr.netlify.app

[openshift-ci]

@openshift-cherrypick-robot: all tests passed!

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