Fixes #13137 - Fix description of -UseNewEnvironment

[sdwheeler]

PR Summary

Fix description of -UseNewEnvironment

• Fixes AB#594576
• Fixes [Start-Process] -UseNewEnvironment parameter behavior change on Windows #13137

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 contributor's guide.
• Style: This PR adheres to the style guide.

[learn-build-service-prod]

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[Copilot]

Pull request overview

Updates the Start-Process reference docs to correct the Windows behavior description for -UseNewEnvironment, aligning it with the reported behavior that User-scope environment variables are included (while process-inherited variables are not).

Changes:

• Rewrites the -UseNewEnvironment parameter description to describe “default” environment variables rather than inheriting the parent process environment.
• Clarifies that on Windows the default environment includes variables from both Machine and User scopes.
• Updates ms.date across affected versioned reference pages.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
reference/7.4/Microsoft.PowerShell.Management/Start-Process.md	Corrects -UseNewEnvironment Windows behavior description; updates ms.date.
reference/7.5/Microsoft.PowerShell.Management/Start-Process.md	Corrects -UseNewEnvironment Windows behavior description; updates ms.date.
reference/7.6/Microsoft.PowerShell.Management/Start-Process.md	Corrects -UseNewEnvironment Windows behavior description; updates ms.date.
reference/7.7/Microsoft.PowerShell.Management/Start-Process.md	Corrects -UseNewEnvironment Windows behavior description; updates ms.date.

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[learn-build-service-prod]

Learn Build status updates of commit 2914218:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/7.4/Microsoft.PowerShell.Management/Start-Process.md	✅Succeeded	View (powershell-7.4)
reference/7.5/Microsoft.PowerShell.Management/Start-Process.md	✅Succeeded	View (powershell-7.5)
reference/7.6/Microsoft.PowerShell.Management/Start-Process.md	✅Succeeded	View (powershell-7.6)
reference/7.7/Microsoft.PowerShell.Management/Start-Process.md	✅Succeeded	View (powershell-7.7)

For more details, please refer to the build report.