Update PowershellV2 task docs

[DmitriiBobreshev]

-- issue https://dev.azure.com/mseng/AzureDevOps/_workitems/edit/1914047
-- and one more issue: https://dev.azure.com/mseng/AzureDevOps/_workitems/edit/1983808
-- add description to progressPreference input

GitHub Issue: https://github.com/microsoft/build-task-team/issues/3465

[prmerger-automator]

@DmitriiBobreshev : Thanks for your contribution! The author(s) have been notified to review your proposed change.

[Jak-MS]

@steved0x @davidstaheli - Can you review this PR?

IMPORTANT: When this content is ready to merge, you must add #sign-off in a comment or the approval may get overlooked.

#label:"aq-pr-triaged"
@MicrosoftDocs/public-repo-pr-review-team

[steved0x]

@DmitriiBobreshev We just published a new task reference that is autogenerated from the task.json, it just went live a day or two ago. I see the changes you are referencing in the task.json for PowerShell@2, as soon as those changes are fully rolled out, they will automatically get added to the new documentation for that task which is here: https://docs.microsoft.com/en-us/azure/devops/pipelines/tasks/reference/powershell-v2?view=azure-pipelines

[DmitriiBobreshev]

Hi @steved0x, as I see the new documentation was updated successfully, but what about utility doc, do we need to create PR for this article, in case if a customer finds this doc through search?