Fix timestretch docstring and tutorial visualization

[mthrok]

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[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/audio/3694

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❌ 7 New Failures, 2 Unrelated Failures

As of commit de45ec3 with merge base 65df10b ():

NEW FAILURES - The following jobs have failed:

• Unit-tests on Linux CPU / tests (3.10) / linux-job (gh)
• Unit-tests on Linux CPU / tests (3.8) / linux-job (gh)
• Unit-tests on Linux CPU / tests (3.9) / linux-job (gh)
• Unit-tests on Linux GPU / tests (3.10, 11.8) / linux-job (gh)
• Unit-tests on Linux GPU / tests (3.8, 11.8) / linux-job (gh)
• Unit-tests on Linux GPU / tests (3.9, 11.8) / linux-job (gh)
• Unittests on Windows CPU / unittests-windows-cpu / windows-job (gh)

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• Unit-tests on Macos CPU / tests / macos-job (gh)
• Unittests on Windows GPU / unittests-windows-gpu / windows-job (gh)

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