Update Set-SPOSite.md

Author: MikePlumleyMSFT

sharepoint/sharepoint-ps/sharepoint-online/Set-SPOSite.md

@@ -336,7 +336,7 @@ Accept wildcard characters: False
 
 ### -SharingCapability
 Determines what level of sharing is available for the site.
-The possible values are: Disabled - external user sharing (share by email) and guest link sharing are both disabled, ExternalUserSharingOnly - external user sharing (share by email) is enabled, but guest link sharing is disabled, or ExternalUserAndGuestSharing - external user sharing (share by email) and guest link sharing are both enabled.
+The possible values are: Disabled - don't allow sharing outside your organization, ExistingExternalUserSharingOnly - Allow sharing only with the external users that already exist in your organization's directory, ExternalUserSharingOnly - allow external users who accept sharing invitations and sign in as authenticated users, or ExternalUserAndGuestSharing - allow sharing with all external users, and by using anonymous access links.
 
 For more information about sharing, see Turn external sharing on or off for SharePoint Online (https://docs.microsoft.com/sharepoint/turn-external-sharing-on-or-off).