Update Set-CsTeamsMeetingPolicy.md

Updating the streaming attendee mode max value to 10k.

Author: chbalaki

teams/teams-ps/teams/Set-CsTeamsMeetingPolicy.md

@@ -1723,7 +1723,7 @@ Possible values are:
 - Disabled
 - Enabled
 
-Set this to Enabled to allow up to 20,000 extra view-only attendees to join.
+Set this to Enabled to allow up to 10,000 extra view-only attendees to join.
 
 ```yaml
 Type: String