Updated with the correct argument (--pred-score-thr) in the multi-modal demo docs

[Barath19]

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Motivation

The argument name for threshold in the multi-modal demo have been changed to --pred-score-thr from --score-thr. However, this is not reflected in the docs. This PR helps in running the multi-modal demo with threshold.

Modification

Modification

Updated the typo in the documentation.

Checklist

1. Pre-commit or other linting tools are used to fix the potential lint issues.
2. The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
3. If the modification has potential influence on downstream projects, this PR should be tested with downstream projects.
4. The documentation has been modified accordingly, like docstring or example tutorials.

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