doc(XO): Change wording to 'prevent migration'

'Prevent' is more appropriate than 'Disable' in this case

Author: thomas-dkmt

Diff for: docs/docs/manage_infrastructure.md

@@ -451,13 +451,13 @@ VM migration with storage motion allows you to migrate a VM from one host to ano
 - Migrating a VM that has VDIs on a shared SR from host A to host B using a particular network must trigger a "VM Migration with Storage Motion" without moving its VDIs.
 - Migrating a VM from host A to host B with a destination SR must trigger a "VM Migration with Storage Motion" and move VDIs to the destination SR, regardless of where the VDIs were stored.
 
-### Disabling VM migration
+### Preventing VM migration
 
 To prevent a virtual machine from migrating:
 
 1. Go to the VM's configuration page.
 2. Go to the **Advanced** tab.
-3. Activate the **Disable migration** toggle switch. 
+3. Activate the **Prevent migration** toggle switch. 
 
 
 When this option is enabled, the VM won't be able to migrate to another host.