Move Default Prompt section above Example Prompts and Behavior

[devin-ai-integration]

Summary

Relocates the Default prompt section higher in the Universal-3 Pro getting started guide for improved discoverability, as requested by George Efremidze. The section was moved from its previous position as a ### subsection under "Prompting" to a standalone ## section placed directly above "Example prompts and behavior."

Content is unchanged — this is a pure move with a heading level promotion (### → ##).

Local Testing

Verified locally with fern docs dev — the section renders correctly in its new position and appears in the "On this page" sidebar between "Overview" and "Example prompts and behavior."

CI note: The lint check failure is pre-existing on main (formatting issues in unrelated files like llm-gateway.mdx, speaker-diarization.mdx, etc.). The fern-check passes.

Review & Testing Checklist for Human

• Verify the ToC / "On this page" sidebar renders the new ## Default prompt heading in the expected position on the deployed docs site
• Confirm the #default-prompt anchor link still resolves correctly (heading text is unchanged, but worth checking since the heading level changed)
• Read the line "See the sections below for examples" in context — it should still make sense since "Example prompts and behavior" and "Prompting" follow below

Notes

Requested by George Efremidze via Slack, triggered by Daniel Ince.

Link to Devin run: https://app.devin.ai/sessions/1a51edfa8ee840199293e13d56b69498

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