Fix Whisper Positional Embeddings when using decoder context

[andyehrenberg]

[HuggingFaceDocBuilderDev]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint.

[sgugger]

cc @ArthurZucker

[github-actions[bot]]

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[barbieri]

is this getting in or really not needed?

[ArthurZucker]

Seems to work well without 😉 Also not sure if the updates on whisper fixed the original issue, would have to check!