Update Set-CsTeamsEventsPolicy.md

Author: SarinaMS

teams/teams-ps/teams/Set-CsTeamsEventsPolicy.md

@@ -119,7 +119,7 @@ Aliases:
 
 Required: False
 Position: Named
-Default value: None
+Default value: Everyone
 Accept pipeline input: False
 Accept wildcard characters: False
 ```