Update JNI binding layer comments to indicate that forward/execute is not thread-safe

[GregoryComer]

Summary: Update doc comments on forward and execute to document that these functions are not thread-safe.

Differential Revision: D66144668

[pytorch-bot]

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[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D66144668

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D66144668

[GregoryComer]

@pytorchbot label "topic: not user facing"

[pytorch-bot]

Didn't find following labels among repository labels: topic: not user facing

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