Fix voxtral instructions

[mergennachin]

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[pytorch-bot]

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❌ 2 New Failures

As of commit 0da3f0d with merge base 41c299f ():

NEW FAILURES - The following jobs have failed:

• Build documentation / build (buck2) / Build doc (gh)
  At least one of the pre-conditions you specified did not hold
• pull / unittest-nxp-neutron / linux-job (gh)
  RuntimeError: Command docker exec -t 2fb8fbbb2fe1a8c6ecc9359e6d2865a10d059742ce78e661a01b83c4a01e4929 /exec failed with exit code 1

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