Summary of the new document or enhancement

The feature will be checked in to PowerShell 7.3 branch.

• List of articles that need to be updated: https://docs.microsoft.com/powershell/module/microsoft.powershell.core/about/about_functions_advanced_methods?view=powershell-7.1
• New articles that need to be created:
• Link(s) to related code PR(s) in the PowerShell/PowerShell repo: Add clean block to script block as a peer to begin, process, and end to allow easy resource cleanup PowerShell/PowerShell#15177
• Link(s) to related issue(s) in the PowerShell/PowerShell repo: Update the resource cleanup RFC PowerShell/PowerShell-RFC#294

Description of what changed

The new 'clean' block will be supported for PowerShell functions and script cmdlets, to help clean up resources.
For details, please take a look at the RFC listed above.