Fixes #10953 - String expression conversion uses invariant culture

[sdwheeler]

PR Summary

String expression conversion uses invariant culture

• Fixes AB#232621
• Fixes Clarify that string interpolation uses the *invariant* culture #10953
• Fixes Clarify that the *system locale* isn't necessarily what governs from-string conversion in parameter binding, and that the *invariant* culture should be used #10954

PR Checklist

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Learn Build status updates of commit a6a01bc:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/5.1/Microsoft.PowerShell.Core/About/about_Quoting_Rules.md	✅Succeeded	View (powershell-5.1)
reference/5.1/Microsoft.PowerShell.Utility/Get-Date.md	✅Succeeded	View (powershell-5.1)
reference/7.2/Microsoft.PowerShell.Core/About/about_Quoting_Rules.md	✅Succeeded	View (powershell-7.2)
reference/7.2/Microsoft.PowerShell.Utility/Get-Date.md	✅Succeeded	View (powershell-7.2)
reference/7.3/Microsoft.PowerShell.Core/About/about_Quoting_Rules.md	✅Succeeded	View (powershell-7.3)
reference/7.3/Microsoft.PowerShell.Utility/Get-Date.md	✅Succeeded	View (powershell-7.3)
reference/7.4/Microsoft.PowerShell.Core/About/about_Quoting_Rules.md	✅Succeeded	View (powershell-7.4)
reference/7.4/Microsoft.PowerShell.Utility/Get-Date.md	✅Succeeded	View (powershell-7.4)
reference/7.5/Microsoft.PowerShell.Core/About/about_Quoting_Rules.md	✅Succeeded	View (powershell-7.5)
reference/7.5/Microsoft.PowerShell.Utility/Get-Date.md	✅Succeeded	View (powershell-7.5)

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[mklement0]

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