Add redirect from /docs/guides/getting-speaker-labels-speaker-diarization to /docs/pre-recorded-audio/speaker-diarization

[devin-ai-integration]

Summary

Adds a redirect from the old speaker diarization guide URL (/docs/guides/getting-speaker-labels-speaker-diarization) to the current location (/docs/pre-recorded-audio/speaker-diarization).

Review & Testing Checklist for Human

• Verify the destination URL /docs/pre-recorded-audio/speaker-diarization exists and loads correctly
• After deployment, test that visiting https://www.assemblyai.com/docs/guides/getting-speaker-labels-speaker-diarization redirects to the correct page

Notes

Requested by Lee Vaughn (@LeeVaughn) via Slack #ask-api-docs

Link to Devin run: https://app.devin.ai/sessions/4097fa9ff83f4661b943c28d530b583c

[devin-ai-integration]

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