Update Web File Repository Integration README.md (demisto#37170)

- Minor formatting cleanup
- added for Cortex XSOAR 8 On-prem, you need to add the ext- FQDN DNS record

Author: julieschwartz18

Diff for: Packs/WebFileRepository/Integrations/WebFileRepository/README.md

@@ -39,14 +39,18 @@ In a web browser, go to **`http://<cortex-xsoar-server-address>:<listen_port>`**
 To access the File Management UI by instance name, make sure ***Instance execute external*** is enabled. 
 
 1. In Cortex XSOAR 6.x:
+
    1. Navigate to **Settings > About > Troubleshooting**.
    2. In the **Server Configuration** section, verify that the `instance.execute.external.<instance_name>` key is set to `true`. If this key does not exist, click **+ Add Server Configuration** and add the `instance.execute.external.<instance_name>` and set the value to `true`. See [this documentation](https://xsoar.pan.dev/docs/reference/articles/long-running-invoke) for further information.
-2. In a web browser:
+3. In a web browser:
+
+   - For Cortex XSOAR 6.x: Go to `https://<cortex-xsoar-address>/instance/execute/<instance_name>`.
+   - For Cortex XSOAR 8 On-prem, Cortex XSOAR 8 Cloud, or Cortex XSIAM: Go to `https://ext-<tenant>.crtx.<region>.paloaltonetworks.com/xsoar/instance/execute/<instance-name>`.
+   - For Multi Tenant environments: Go to `https://<cortex-xsoar-address>/acc_<account name>/instance/execute/<instance_name>`.  
 
-   - (For Cortex XSOAR 6.x) go to `https://<cortex-xsoar-address>/instance/execute/<instance_name>/`
-   - (For Cortex XSOAR 8 or Cortex XSIAM) `https://ext-<tenant>.crtx.<region>.paloaltonetworks.com/xsoar/instance/execute/<instance-name>`
-   -  (In Multi Tenant environments) `https://<cortex-xsoar-address>/acc_<account name>/instance/execute/<instance_name>/`
-  
+      **Note**:  
+      For Cortex XSOAR 8 On-prem, you need to add the `ext-` FQDN DNS record to map the Cortex XSOAR DNS name to the external IP address.    
+      For example, `ext-xsoar.mycompany.com`.
 
 ## Commands