DOC-14: document Cloud topic segment size default

[micheleRP]

Resolves DOC-14.

What

Adds a Segment size row to the topic-properties table on the Cloud "Topics Overview" page (modules/develop/pages/topics/create-topic.adoc).

Why

Redpanda Cloud sets log_segment_size to 128 MiB at the cluster level, unlike self-managed Redpanda (1 GiB). This Cloud-specific default was not documented anywhere in cloud-docs, so Cloud users relying on the self-managed default were misinformed. Verified against cloudv2 main (install-pack fixtures, cluster-config runbook).

Note for reviewers

The per-tier min/max are intentionally described as "limits that depend on your cluster tier" rather than hardcoded. install-pack/generate-tiers.py (max = tier default) and the install-pack fixtures (max 256 MiB, min 16 MiB) disagree, so the exact range isn't reliable across tiers. Recommend confirming the min/max with the Cloud team before stating explicit numbers.

Preview pages

• Topics Overview (updated)

🤖 Generated with Claude Code

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 48d31f11-1f25-4251-ab14-a3f28032de3b

📥 Commits

Reviewing files that changed from the base of the PR and between 191269d and 324b01a.

📒 Files selected for processing (1)

• modules/develop/pages/topics/create-topic.adoc

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📝 Walkthrough

Walkthrough

Adds a “Segment size” row to the topic properties table. The documentation describes the log segment maximum size, Redpanda’s behavior when the limit is reached, the 128 MiB cluster-level default, and per-topic overrides through segment.bytes, subject to tier-dependent limits.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Suggested reviewers: mattschumpert, kbatuigas, Feediver1

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly matches the change: documenting the Cloud topic segment size default.
Description check	✅ Passed	The description is detailed and relevant, though it omits the review deadline and explicit checklist selections 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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch DOC-14-cloud-segment-size-default

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