Update manage-video-web.md

Author: chriswhilar

articles/communication-services/how-tos/calling-sdk/includes/manage-video/manage-video-web.md

@@ -486,4 +486,4 @@ await callObj2.mute();
 Limitations:
 - This must be done with two different call agents with different identities, hence the code snippet shows two call agents being used.
 - Sending two cameras with one CallAgent is currently not supported.
-- OnMac Safari, background blur video effects (from @azure/communication-effects), can only be applied to one camera
+- OnMac Safari, background blur video effects (from @azure/communication-effects), can only be applied to one camera, and not both at the same time.