(GH-9039) Document ordered hash table for ConvertFrom-Json

[michaeltlombardi]

PR Summary

Prior to this change, the ConvertFrom-Json cmdlet returnedd a Hashtable object when used with the AsHashtable parameter. Starting with PowerShell 7.3, it instead returns an OrderedHashtable object.

This change:

• Modifies the output type and parameter documentation to reflect the updated object type for 7.3.
• Updates the parameter documentation for 7.0+ to better reflect the reasons to use the AsHashtable parameter.
• Resolves ConvertFrom-Json -AsHashtable now uses ordered hashtable #9039
• Fixes AB#4440

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.

[opbld30]

Docs Build status updates of commit 587ecfd:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/7.3/Microsoft.PowerShell.Utility/ConvertFrom-Json.md	✅Succeeded	View (powershell-7.3)

For more details, please refer to the build report.

Note: Broken links written as relative paths are included in the above build report. For broken links written as absolute paths or external URLs, see the broken link report.

For any questions, please:

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[opbld32]

Docs Build status updates of commit af70c93:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/7.0/Microsoft.PowerShell.Utility/ConvertFrom-Json.md	✅Succeeded	View (powershell-7)
reference/7.2/Microsoft.PowerShell.Utility/ConvertFrom-Json.md	✅Succeeded	View (powershell-7.2)
reference/7.3/Microsoft.PowerShell.Utility/ConvertFrom-Json.md	✅Succeeded	View (powershell-7.3)

For more details, please refer to the build report.

Note: Broken links written as relative paths are included in the above build report. For broken links written as absolute paths or external URLs, see the broken link report.

For any questions, please:

• Try searching the docs.microsoft.com contributor guides
• Post your question in the Docs support channel