[doc] Update options documentation for torch.compile

[lanluo-nvidia]

Description

TensorRT backend for torch.compile documentation, In the snippet it sets the precision using options={"precision": torch.half} which isn’t documented and dosen’t seem to have effect and it should be replaced by options={"enabled_precisions": [torch.half]}

Fixes # (issue)

Type of change

• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project (You can use the linters)
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas and hacks
• I have made corresponding changes to the documentation
• I have added tests to verify my fix or my feature
• New and existing unit tests pass locally with my changes
• I have added the relevant labels to my PR in so that relevant reviewers are notified

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[narendasan]

LGTM