Update docs/upgrade/v1-5-x-to-v1-6-0.md

Co-authored-by: Daria Vladykina <[email protected]>
Signed-off-by: PoAn Yang <[email protected]>

Author: FrankYang0529

docs/upgrade/v1-5-x-to-v1-6-0.md

@@ -248,7 +248,7 @@ To fix this, you can restart the VM.
 
 ![vm-restart](/img/v1.6/upgrade/vm-restart.png)
 
-#### Why there is the message with running VMs?
+#### Why does the message about running VMs appear?
 
 Before Harvester v1.6.0, the controller patched the MAC address from the VMI into the VM spec during VM creation. This ensured that the MAC address remained consistent after a VM restart. However, this approach modified the VM spec without requiring a restart, which caused the KubeVirt controller to add a "RestartRequired" condition to the VM status. Previously, this condition was not displayed in the UI, though it was visible in the VM’s YAML.