Fix remaining Acrolinx validation feedback

- Added ms.custom: references_regions to 4 remaining files (understand-baseline-settings-parameter.md, 02-setup-prerequisites.md, 03-network-requirements.md, 04-operations-troubleshooting.md)
- Added introductory paragraph to 02-setup-prerequisites.md between H1 and first H2
- Fixed sequential steps formatting: Changed numbered sub-lists to bullets for non-sequential items in deploy-a-baseline-policy-assignment.md and assign-built-in-policies.md
- Improved document structure and compliance with Azure documentation standards

Author: Mutemwa Masheke

articles/governance/machine-configuration/how-to/assign-built-in-policies.md

@@ -29,19 +29,19 @@ To view and explore these built-in policies:
 
 4.  Browse the list to review available definitions, such as:
 
-    1.  *Audit Linux machines that have the specified applications installed*
+    - *Audit Linux machines that have the specified applications installed*
 
-    2.  *Audit Windows machines that are not set to the specified time zone*
+    - *Audit Windows machines that are not set to the specified time zone*
 
-    3.  *Windows machines should meet requirements for the Azure compute security baseline*
+    - *Windows machines should meet requirements for the Azure compute security baseline*
 
 5.  Click any policy name to open its details page. You can inspect:
 
-    1.  The JSON definition
+    - The JSON definition
 
-    2.  Available parameters and versions
+    - Available parameters and versions
 
-    3.  Metadata such as category, mode, and required providers
+    - Metadata such as category, mode, and required providers
 
 [![Screenshot of policy definition details page showing JSON definition and parameters.](../media/discover-and-assign-built-in-machine-configuration-policies/policy-definition-details-json-parameters.png)](../media/discover-and-assign-built-in-machine-configuration-policies/policy-definition-details-json-parameters.png#lightbox)
 

articles/governance/machine-configuration/how-to/assign-security-baselines/deploy-a-baseline-policy-assignment.md

@@ -33,11 +33,11 @@ The portal provides the most direct path to create or test a baseline assignment
 
 2.  Under **Definitions**, choose your desired baseline—for example:
 
-    1.  *\[Preview\]* Official CIS Security Benchmarks for Linux Workloads
+    - *\[Preview\]* Official CIS Security Benchmarks for Linux Workloads
 
-    2.  *Azure Security Baseline for Windows*
+    - *Azure Security Baseline for Windows*
 
-    3.  *Azure Security Baseline for Linux*
+    - *Azure Security Baseline for Linux*
 
 ### Step 2—Select and Customize
 
@@ -58,9 +58,9 @@ Use this file later when creating the assignment.
 
 2.  In the page, define:
 
-    1.  **Scope** (subscription or management group)
+    - **Scope** (subscription or management group)
 
-    2.  **Assignment name** and optional description
+    - **Assignment name** and optional description
 
 3.  Under the **Parameters** tab, locate **Baseline Settings**. You may need to uncheck *"Only show parameters that need input or review"*
 

articles/governance/machine-configuration/how-to/assign-security-baselines/specify-custom-parameters-for-baseline-policy.md

@@ -54,7 +54,7 @@ On the **Modify settings** tab, review and adjust configuration rules for your s
 
 - For configurable rules, edit the **Parameter value** field to define your organization's required state.
 
-[![Screenshot of security baseline rules list with checkboxes and parameter value fields.](../../media/specify-custom-parameters-for-baseline-policy/security-baseline-rules-list-with-checked-boxes.png)](../../media/specify-custom-parameters-for-baseline-policy/security-baseline-rules-list-with-checked-boxes.png#lightbox)
+[![Screenshot of security baseline rules list with checkboxes and parameter value fields.](../../media/specify-custom-parameters-for-baseline-policy/security-base-line-rules-list-with-checked-boxes.png)](../../media/specify-custom-parameters-for-baseline-policy/security-base-line-rules-list-with-checked-boxes.png#lightbox)
 
 - View per rule Metadata by clicking on a highlighted rule. This action opens the context pane showing details such as **Rule ID**, **Description**, **Severity**, and **Compliance Standard**.
 

articles/governance/machine-configuration/how-to/assign-security-baselines/understand-baseline-settings-parameter.md

@@ -3,6 +3,7 @@ title: Understand The Baseline Settings Parameter Format
 description: Learn how to read and author baseline JSON parameters for Azure Machine Configuration security baselines including CIS Linux Benchmarks and Azure Security Baselines for Windows and Linux.
 ms.date: 11/07/2025
 ms.topic: conceptual
+ms.custom: references_regions
 ---
 
 # Understand the Baseline Settings Parameter Format

articles/governance/machine-configuration/overview/02-setup-prerequisites.md

@@ -3,10 +3,13 @@ description: Configure the required components, extensions, and identities neede
 ms.date: 11/07/2025
 ms.topic: how-to
 title: Azure Machine Configuration prerequisites
+ms.custom: references_regions
 ---
 
 # Azure Machine Configuration prerequisites
 
+Azure Machine Configuration provides native capability to audit or configure operating system settings as code, both for machines running in Azure and hybrid Arc-enabled machines. Before you can use machine configuration to manage your environment, you must enable the prerequisites for the service.
+
 ## Enable machine configuration
 
 To manage the state of machines in your environment, including machines in Azure

articles/governance/machine-configuration/overview/03-network-requirements.md

@@ -3,6 +3,7 @@ description: Configure network connectivity, endpoints, and private link setting
 ms.date: 11/07/2025
 ms.topic: how-to
 title: Azure Machine Configuration network requirements
+ms.custom: references_regions
 ---
 
 # Azure Machine Configuration network requirements

articles/governance/machine-configuration/overview/04-operations-troubleshooting.md

@@ -3,6 +3,7 @@ description: Monitor, troubleshoot, and manage Azure Machine Configuration deplo
 ms.date: 11/07/2025
 ms.topic: how-to
 title: Troubleshooting Azure Machine Configuration 
+ms.custom: references_regions
 ---
 
 # Troubleshooting Azure Machine Configuration