Update traffic-analytics.md

Temporarily removing West US3 from supported regions of LAW

Author: Harsha-CS

articles/network-watcher/traffic-analytics.md

@@ -168,8 +168,7 @@ The Log Analytics workspace must exist in the following regions:
       West Central US  
       West Europe  
       West US  
-      West US 2  
-      West US 3  
+      West US 2   
    :::column-end:::
 :::row-end:::