Fixes metadata for external help file.

Author: kenwith

skype/skype-ps/skype/Get-CsHybridApplicationEndpoint.md

@@ -1,5 +1,5 @@
 ---
-external help file:Microsoft.Rtc.Management.dll-help.xml
+external help file: Microsoft.Rtc.Management.dll-help.xml
 applicable: Lync Server 2013, Skype for Business Server 2015, Skype for Business Server 2019
 title: Get-CsHybridApplicationEndpoint
 schema: 2.0.0