Task #544790: Replace SSH password authentication with SSH key authentication in tutorial-filter-network-traffic.md

- Replaced --authentication-type password with --generate-ssh-keys for vm-web creation (line 677)
- Removed --assign-identity parameter (not required for SSH key authentication)
- Aligns with Azure security best practices by using SSH key pairs instead of password authentication
- The vm-mgmt VM already uses SSH keys (line 709), now both VMs are consistent

Author: asudbring

articles/virtual-network/tutorial-filter-network-traffic.md

@@ -674,8 +674,7 @@ az vm create \
   --subnet subnet-1 \
   --nsg "" \
   --admin-username azureuser \
-  --authentication-type password \
-  --assign-identity
+  --generate-ssh-keys
 ```
 
 The VM takes a few minutes to create. After the VM is created, output similar to the following example is returned: