added $file to the ArgumentList

[ybeltrikov]

PR Summary

This changes fixes unused variable $file in the documentation for creating custom PS Script Analyzer rules.

- Fixes #197 
- Resolves #197 

PR Checklist

• [x] Descriptive Title: added optional $file parameter to the ArgumentList
• [x] Summary: The $file parameter is defined earlier in this code block but is never used. Added it to the Argument List.
• [x] Contributor's Guide: I have read the [contributors guide][contrib].
• [x] Style: This PR adheres to the [style guide][style].

[learn-build-service-prod[bot]]

Learn Build status updates of commit 8cbd1e4:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
reference/docs-conceptual/PSScriptAnalyzer/create-custom-rule.md	:white_check_mark:Succeeded	View (ps-modules)

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[github-actions[bot]]

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