[DOC] Set strict export explicitly for API change

[CuiYifeng]

pytorch/pytorch#148790 and pytorch/pytorch#150941 flip the default value of strict argument in torch.export.export and torch.export.export_for_training from True to False. The workflow of PT2E CPU/XPU has been broken by this API change.
This PR is to fix documents with setting strict=True explicitly.

[pytorch-bot]

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[CuiYifeng]

@ZhiweiYan-96 Please help review, thanks.

[ZhiweiYan-96]

@leslie-fang-intel Could you please have a look?