docs: Add traffic config ref link

[Sherlock113]

What does this PR address?

Fixes #(issue)

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[hyperlint-ai]

PR Change Summary

Added a reference link for traffic configuration in the documentation.

• Introduced a reference link for traffic configuration in the configurations documentation.
• Updated the autoscaling documentation to include a reference to traffic configuration.

Modified Files

• docs/source/reference/bentoml/configurations.rst
• docs/source/scale-with-bentocloud/scaling/autoscaling.rst

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