Merge pull request MicrosoftDocs#2006 from bjwhalen/patch-31

Update Disable-CsOnlineSipDomain.md

Author: kenwith

skype/skype-ps/skype/Disable-CsOnlineSipDomain.md

@@ -1,5 +1,5 @@
 ---
-external help file: Microsoft.Rtc.Management.dll-help.xml
+external help file: Microsoft.Rtc.Management.Hosted.dll-help.xml
 applicable: Skype for Business Online
 title: Disable-CsOnlineSipDomain
 schema: 2.0.0