Fix <maml:paragraph> elements in cmdlet doc examples to <maml:para>

[MatejKafka]

PR Summary

Discussed on the PowerShell Discord server. The documentation for adding examples to XML cmdlet docs uses paragraph tags, para should be used instead. Also fixes casing for the introduction element in the same examples.

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.
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• Style: This PR adheres to the style guide.

[learn-build-service-prod]

Learn Build status updates of commit 29834e9:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/docs-conceptual/developer/help/how-to-add-examples-to-a-cmdlet-help-topic.md	✅Succeeded	View (>=powershell-5.1)

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[github-actions]

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[sdwheeler]

Thanks for the fix