Update Set-CsExternalAccessPolicy.md

Fix a parameter description bug

Author: krammerliu

teams/teams-ps/teams/Set-CsExternalAccessPolicy.md

@@ -22,7 +22,7 @@ This cmdlet was introduced in Lync Server 2010.
 Set-CsExternalAccessPolicy [[-Identity] <XdsIdentity>]
  [-AllowedExternalDomains <List>]
  [-BlockedExternalDomains <List>]
- [-CommunicationWithExternalOrgs <Boolean>]
+ [-CommunicationWithExternalOrgs <String>]
  [-Confirm]
  [-Description <String>]
  [-EnableAcsFederationAccess <Boolean>]
@@ -47,7 +47,7 @@ Set-CsExternalAccessPolicy [[-Identity] <XdsIdentity>]
 Set-CsExternalAccessPolicy [-Instance <PSObject>]
  [-AllowedExternalDomains <List>]
  [-BlockedExternalDomains <List>]
- [-CommunicationWithExternalOrgs <Boolean>]
+ [-CommunicationWithExternalOrgs <String>]
  [-Confirm]
  [-Description <String>]
  [-EnableAcsFederationAccess <Boolean>]