requirements: Remove line about selinux

[StephanDollberg]

Some renewed throughput benchmarks show no measurable impact of selinux.

Remove it to avoid questions about it.

Description

Resolves https://redpandadata.atlassian.net/browse/
Review deadline:

Page previews

Checks

• New feature
• Content gap
• Support Follow-up
• Small fix (typos, links, copyedits, etc)

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📝 Walkthrough

Walkthrough

This PR removes a warning from the Tuning section of the deployment requirements documentation. Previously, the section contained guidance noting that enabling SELinux may add performance overhead and recommending its disablement when not required. The change removes this two-line note, allowing the Tuning section to proceed directly from its introductory sentence to the conditional references for Kubernetes and non-Kubernetes tuning documentation.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• redpanda-data/docs#1604: Previously added or moved SELinux performance-overhead guidance into the same Tuning section that this PR now removes it from.

Suggested reviewers

• travisdowns
• ballard26

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'requirements: Remove line about selinux' clearly and concisely describes the main change—removal of SELinux-related content from the requirements documentation.
Description check	✅ Passed	The description provides rationale for the change (benchmark results showing no SELinux impact) and follows the template structure, but the JIRA ticket reference remains as a placeholder and no page previews were provided.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch stephna/remove-selinux-line

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[Feediver1]

lgtm