Update afsdiag section for v11 changes

Added section for v11 changes to afsdiag cmdlet.

Author: chris-wituchowski

articles/storage/files/storage-sync-files-troubleshoot.md

@@ -1244,7 +1244,25 @@ If you encounter issues with Azure File Sync on a server, start by completing th
 3. Verify the Azure File Sync filter drivers (StorageSync.sys and StorageSyncGuard.sys) are running:
     - At an elevated command prompt, run `fltmc`. Verify that the StorageSync.sys and StorageSyncGuard.sys file system filter drivers are listed.
 
-If the issue is not resolved, run the AFSDiag tool:
+If the issue is not resolved, run the AFSDiag tool and send its .zip file output to the support engineer assigned to your case for further diagnosis.
+
+For Agent Version v11 and Later:
+
+1. Open an elevated PowerShell window, and then run the following commands (press Enter after each command):
+
+    > [!NOTE]
+    >AFSDiag will create the output directory and a temp folder within it prior to collecting logs and will delete the temp folder after execution. Specify an output location which does not contain data.
+    
+    ```powershell
+    cd "c:\Program Files\Azure\StorageSyncAgent"
+    Import-Module .\afsdiag.ps1
+    Debug-AFS -OutputDirectory C:\output -KernelModeTraceLevel Verbose -UserModeTraceLevel Verbose
+    ```
+
+2. Reproduce the issue. When you're finished, enter **D**.
+3. A .zip file that contains logs and trace files is saved to the output directory that you specified. 
+
+For Agent Version v10 and Earlier:
 1. Create a directory where the AFSDiag output will be saved (for example, C:\Output).
     > [!NOTE]
     >AFSDiag will delete all content in the output directory prior to collecting logs. Specify an output location which does not contain data.