(MAINT) Fix wording for deleted policy requirements

Prior to this change, the section describing required actions when
an Azure Policy assignment is deleted used the same leading text
for each paragraph, even though they describe different required
actions.

This is because a critical phrase was erroneously removed from the
second paragraph, distinguishing what users need to do when an
Azure Policy assignment is deleted _from an initiative_.

This change adds the phrase back into the document.

Author: michaeltlombardi

articles/governance/machine-configuration/assignments.md

@@ -1,7 +1,7 @@
 ---
 title: Understand machine configuration assignment resources
 description: Machine configuration creates extension resources named machine configuration assignments that map configurations to machines.
-ms.date: 04/18/2023
+ms.date: 08/10/2023
 ms.topic: conceptual
 ---
 # Understand machine configuration assignment resources
@@ -41,9 +41,9 @@ more information, see [getting compliance data][02].
 When an Azure Policy assignment is deleted, if the policy created a machine configuration
 assignment, the machine configuration assignment is also deleted.
 
-When an Azure Policy assignment is deleted, you need to manually delete any machine configuration
-assignments the policy created. You can do so by navigating to the guest assignments page on Azure
-portal and deleting the assignment there.
+When an Azure Policy assignment is deleted from an initiative, you need to manually delete any
+machine configuration assignments the policy created. You can do so by navigating to the guest
+assignments page on Azure portal and deleting the assignment there.
 
 ## Manually creating machine configuration assignments