Remove Private Preview notes from policy parameters

Removed notes indicating that parameters are in Private Preview for AllowedExternalDomains, BlockedExternalDomains, and CommunicationWithExternalOrgs.

Author: krammerliu

teams/teams-ps/MicrosoftTeams/New-CsExternalAccessPolicy.md

@@ -140,9 +140,6 @@ In this example, we create an ExternalAccessPolicy named "GranularFederationExam
 
 > Applicable: Lync Server 2010, Lync Server 2013, Skype for Business Server 2015, Skype for Business Server 2019
 
-> [!NOTE]
-> Please note that this parameter is in Private Preview.
-
 Specifies the external domains allowed to communicate with users assigned to this policy. This setting is applicable only when `CommunicationWithExternalOrgs` is configured to `AllowSpecificExternalDomains`. This setting can be modified only in custom policy. In Global (default) policy `CommunicationWithExternalOrgs` can only be set to `OrganizationDefault` and cannot be changed.
 
 ```yaml
@@ -160,9 +157,6 @@ Accept wildcard characters: False
 
 > Applicable: Lync Server 2010, Lync Server 2013, Skype for Business Server 2015, Skype for Business Server 2019
 
-> [!NOTE]
-> Please note that this parameter is in Private Preview.
-
 Specifies the external domains blocked from communicating with users assigned to this policy. This setting is applicable only when `CommunicationWithExternalOrgs` is configured to `BlockSpecificExternalDomains`. This setting can be modified only in custom policy. In Global (default) policy `CommunicationWithExternalOrgs` can only be set to `OrganizationDefault` and cannot be changed.
 
 ```yaml
@@ -180,9 +174,6 @@ Accept wildcard characters: False
 
 > Applicable: Lync Server 2010, Lync Server 2013, Skype for Business Server 2015, Skype for Business Server 2019
 
-> [!NOTE]
-> Please note that this parameter is in Private Preview.
-
 Indicates how users assigned to the policy can communicate with external organizations (domains). This setting has 5 possible values:
 
 - OrganizationDefault: users follow the federation settings specified in `TenantFederationConfiguration`. This is the default value.