fix: benchmark stream density documentation updated

[rishika-y-gaur]

Two files updated for stream density benchmark changes

Resolves:#235

PR Checklist

• Added label to the Pull Request for easier discoverability and search
• Commit Message meets guidelines as indicated in the URL https://github.com/intel-retail/automated-self-checkout/blob/main/CONTRIBUTING.md
• PR introduces changes that breaks compatibility with other modules (If YES, please provide details below)
• No Employer Confidential details are added

What requirement is this design document for?

#235

Anything the reviewer should know when reviewing this PR?

If there are any other design Pull Requests or requirements, please link them here (i.e. intel-retail/automated-self-checkout )

intel-retail/loss-prevention#322

[Copilot]

Pull request overview

Updates the Loss Prevention stream-density benchmarking documentation to reflect the new per-stream target FPS behavior (targetFps) and provides guidance/examples for configuring it.

Changes:

• Clarifies stream-density benchmark pass/fail behavior using per-stream targetFps (with fallback behavior).
• Adds documentation for configuring per-stream targetFps and includes CLI examples.
• Updates the sample camera_to_workload*.json snippet to show a targetFps field.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
docs/user-guide/loss-prevention/lp-benchmarking.md	Updates user-guide benchmark docs to describe per-stream targetFps behavior and adds targetFps to the example config.
docs_src/use-cases/loss-prevention/performance.md	Mirrors the same stream-density/per-stream targetFps documentation updates in the docs source file.

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