Added link to upgrade main.tf file from main README

README.md

@@ -1066,10 +1066,10 @@ This mode makes use of the Terraform Command Line Interface (CLI) to deploy and
    >>>> Replace the x_y_z with the eDSF Kit version in the zip file name
    ```
 
-4. Enter the details of DSF Hubs and Agentless Gateways which you want to upgrade, and the desired configuraiton options, in the _main.tf_ file.
-   
-   More information can be found in the <a href="https://github.
-com/imperva/dsfkit/blob/master/modules/aws/sonar-upgrader/README.md#sonar-version-constraints">Sonar Upgrader</a> module's README.
+4. Enter the details of DSF Hubs and Agentless Gateways which you want to upgrade, and the desired configuraiton options, in the <a href="https://github.com/imperva/dsfkit/blob/1.7.1/examples/aws/sonar_upgrade/main.tf">main.tf</a> file.
+
+
+   More information can be found in the <a href="https://github.com/imperva/dsfkit/blob/master/modules/aws/sonar-upgrader/README.md#sonar-version-constraints">Sonar Upgrader</a> module.
 
 
    If you need help doing that, please contact [Imperva Technical Support](https://support.imperva.com/s/).