Update parameter syntax from 'parameter' to 'parameters'

[Gijsreyn]

PR Summary

Fixes parameter to parameters as that's the function.

Fix #401

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.

[learn-build-service-prod]

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[learn-build-service-prod]

Learn Build status updates of commit 1595d0b:

✅ Validation status: passed

File	Status	Preview URL	Details
dsc/docs-conceptual/dsc-3.0/reference/schemas/definitions/parameters/dataTypes.md	✅Succeeded	View (dsc-3.0)

For more details, please refer to the build report.

[Copilot]

Pull request overview

Updates the DSC 3.0 documentation examples to use the correct configuration expression function name parameters() (plural) when referencing parameters.

Changes:

• Replaces parameter('...') with parameters('...') in YAML code blocks for parameter access examples.

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