Fix automatic variable case (9/9)

[surfingoldelephant]

PR Summary

This PR fixes incorrect automatic variable casing used in selected files. E.g., $Args (incorrect) -> $args (correct).

Context

This is PR 9/9 in a series that ensures the correct case is consistently used for individual automatic variables, as documented in about_Automatic_Variables and verified by tab completion. As requested, the PRs are split into groups of ~40 files. Within each file, correct casing is applied to all referenced automatic variables.

Changes in scope:

• Variables with a $ or @ sigil.
• Variables referenced by name without a sigil.

Out of scope:

• Preference variables (separate PRs to follow).
• Misuse of an automatic variable (e.g., naming a function parameter as $Input).
• Reference to the variable's value (e.g., false/False/FALSE when referring to the value of $false).

PR Checklist

• Descriptive Title: This PR's title is a synopsis of the changes it proposes.
• Summary: This PR's summary describes the scope and intent of the change.
• Contributor's Guide: I have read the contributors guide.
• Style: This PR adheres to the style guide.

[github-actions]

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[learn-build-service-prod]

Learn Build status updates of commit d5a2d90:

✅ Validation status: passed

File	Status	Preview URL	Details
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[sdwheeler]

@surfingoldelephant Thanks again for all the updates.