Some fixes for README.md, UseSingularNouns.md

[Hrxn]

PR Summary

• ReviewUnusedParameter now has configurable options since latest PSScriptAnalyzer release, but the rule overview table did not reflect that yet
• Use "correct" rule name (PSUseSingularNouns) in example, for consistency with other included rules examples
• Fixed wrong parameter name in UseSingularNouns.md parameter section [1]
• Changed order in config example to be more like other built-in rules

[1] This seems to be the correct parameter name:
https://github.com/PowerShell/PSScriptAnalyzer/blob/a0365a56068f711ee1ec08fae11a85fcc1542f8c/Rules/UseSingularNouns.cs#L35-L38

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]

Learn Build status updates of commit 9cbdb8c:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/docs-conceptual/PSScriptAnalyzer/Rules/README.md	✅Succeeded	View (ps-modules)
reference/docs-conceptual/PSScriptAnalyzer/Rules/UseSingularNouns.md	✅Succeeded	View (ps-modules)

For more details, please refer to the build report.

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[github-actions]

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[sdwheeler]

Thanks for the update