add a new Q&A about locks

Author: halkazwini

articles/network-watcher/frequently-asked-questions.yml

@@ -184,6 +184,11 @@ sections:
         answer: |
           Flow logs version 2 introduces the concept of *flow state* and stores information about bytes and packets transmitted. For more information, see [NSG flow log format](./network-watcher-nsg-flow-logging-overview.md#log-format).
 
+      - question: |
+          Can I create a flow log for a network security group that has a lock?
+        answer: |
+          A **read-only** lock on a network security group prevents the creation of the corresponding NSG flow log. However, a **cannot-delete** lock on the network security group doesn't prevent the creation or modification of the corresponding NSG flow log.
+
 additionalContent: |
 
   ## Next steps