fix(DOC-1959): remove orphaned raft_election_timeout_ms section from cluster properties

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Summary

Follow-up to #1611. Closes out DOC-1959.

PR #1611 added an exclude_from_docs override for raft_election_timeout_ms in docs-data/property-overrides.json. That override succeeded at the source-JSON layer (modules/reference/attachments/redpanda-properties-v26.1.6.json on main no longer contains the property), but the rendered modules/reference/partials/properties/cluster-properties.adoc partial was never regenerated. As a result, the published Cluster Properties page still showed a raft_election_timeout_ms entry, leaving DOC-1959 unsatisfied.

This PR deletes the orphaned 47-line section directly from the partial. Future auto-docs regeneration runs will preserve the deletion because the source v26.1.6 JSON no longer contains the property.

Verify

• On the Netlify deploy preview, navigate to Reference > Properties > Cluster Properties and confirm Ctrl+F raft_election_timeout_ms returns no hits.
• Confirm election_timeout_ms (the correct user-facing property) is unchanged.

Test plan

• Netlify build passes
• grep -rn raft_election_timeout_ms modules/ returns zero hits

🤖 Generated with Claude Code

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📝 Walkthrough

Walkthrough

This pull request removes the documentation section for the raft_election_timeout_ms cluster property from the cluster properties reference file. The deletion eliminates a 47-line documentation block, after which the raft_enable_longest_log_detection property documentation now appears immediately following the quota_manager_gc_sec property entry. The change is a straightforward documentation cleanup with no alterations to code entities or functional definitions.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• redpanda-data/docs#1359: Makes adjacent documentation formatting changes in cluster-properties.adoc without modifying property content or semantics.
• redpanda-data/docs#1620: Modifies cluster property documentation related to cluster-properties.adoc, specifically including adjustments to the raft_election_timeout_ms section.

Suggested reviewers

• micheleRP
• joe-redpanda
• paulohtb6

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and specifically describes the main change: removing an orphaned raft_election_timeout_ms section from cluster properties documentation.
Description check	✅ Passed	The description provides comprehensive context, rationale, and verification steps, though it omits the Jira ticket link and check box selection from the template.
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 fix/doc-1959-remove-raft-election-timeout-section

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