Update exchange.md

qinezh · qinezh · commit afadff96d12c · 2019-11-07T19:12:57.000+08:00
diff --git a/exchange/exchange-ps/exchange/exchange.md b/exchange/exchange-ps/exchange/exchange.md
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 # Exchange PowerShell
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+## Description
 Exchange PowerShell is built on Windows PowerShell technology and provides a powerful command-line interface that enables automation of administrative tasks. The following PowerShell environments are available in Exchange:
 
 - [Exchange Server PowerShell (Exchange Management Shell)](https://docs.microsoft.com/powershell/exchange/exchange-server/exchange-management-shell)
