architecture: Don't mention SMP

[StephanDollberg]

This confuses SMP. SMP in the context of seastar always refers to symmetric multiprocessing / shared-memory multiprocessing (and the respective --smp seastar flag).

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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[coderabbitai]

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: 2ff3d039-5033-42d5-bb1d-791e1cb9dd5b

📥 Commits

Reviewing files that changed from the base of the PR and between 3887de6 and 2b02a92.

📒 Files selected for processing (1)

• modules/get-started/pages/architecture.adoc

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📝 Walkthrough

Walkthrough

In modules/get-started/pages/architecture.adoc, the Thread-per-core model section description was changed to replace "structured message passing (SMP)" with "message passing" when describing communication between pinned threads. Additionally, the AsciiDoc // end::single-source[] directive closing marker was adjusted or confirmed at line 101.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change: removing SMP terminology from the architecture documentation to avoid confusion.
Description check	✅ Passed	The description provides context for the change and marks the checkbox for 'Small fix', but the Jira ticket link is incomplete (shows placeholder '').
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 stephan/remove-smp

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