docs: fix import path typos in Voice Agents Quickstart

[gotalab]

Summary

Align import path references for consistency in the voice agents quickstart guides.

Changes

• Before: import { RealtimeAgent } from '@openai/agents-realtime'
• After: import { RealtimeAgent } from '@openai/agents/realtime'
• Before: import { RealtimeSession } from '@openai/agents-realtime'
• After: import { RealtimeSession } from '@openai/agents/realtime'

Notes

• Docs-only change. No runtime code affected.
• Applies to en/ja/ko/zh quickstart pages.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 4ea8a48

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[seratch]

Actually both work, but consistency is good