Update allowselfservicepurchase-powershell.md

[msbemba]

trafficstars

Made changes to the parameter in Update-MSCommerceProductPolicy

fixes#https://github.com/MicrosoftDocs/microsoft-365-docs-pr/issues/23790

[msbemba]

@JohanFreelancer9 Please copy review

[learn-build-service-prod[bot]]

Learn Build status updates of commit eae3ab6:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
microsoft-365/commerce/subscriptions/allowselfservicepurchase-powershell.md	:white_check_mark:Succeeded

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 learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[yogkumgit]

@cmcatee-MSFT Please merge this PR. Thanks

[yogkumgit]

@cmcatee-MSFT Gentle reminder