Add redirect from api-reference/realtime/create-temporary-token to universal-streaming/authenticate-with-a-temporary-token

[devin-ai-integration]

Summary

Adds a redirect from /docs/api-reference/realtime/create-temporary-token to /docs/universal-streaming/authenticate-with-a-temporary-token.

This redirect was requested to help users find the correct documentation for temporary token authentication in the universal streaming API.

Review & Testing Checklist for Human

• Verify the destination page /docs/universal-streaming/authenticate-with-a-temporary-token exists and is the correct target
• After deployment, test that visiting https://www.assemblyai.com/docs/api-reference/realtime/create-temporary-token redirects to the expected page

Notes

• Link to Devin run: https://app.devin.ai/sessions/c4560fc43e19494393602eca9420134a
• Requested by: dylan.duan@assemblyai.com (@dylan-duan-aai)

[devin-ai-integration]

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