Make powershell code snippets easy to copy/paste

[martencassel]

File: datacenter/ucp/2.2/guides/admin/configure/join-windows-worker-nodes.md, CC @JimGalasyn

Please make powershell snippets easy to copy/paste. Right now you need to manually remove all the PS> prefixes from the snippet.

I suggess you remove the PS> prefix on PowerShell lines and just mark the snippet box with powershell.

[docker-robott]

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