Merge pull request Azure#8346 from alexandair/patch-3

Fix a header and some typos

Author: cormacpayne

src/Compute/Compute/help/Update-AzVM.md

@@ -1,4 +1,4 @@
----
+---
 external help file: Microsoft.Azure.PowerShell.Cmdlets.Compute.dll-Help.xml
 Module Name: Az.Compute
 ms.assetid: 38917534-49C6-47EA-B815-240F794EE655
@@ -74,7 +74,7 @@ Accept wildcard characters: False
 ```
 
 ### -AssignIdentity
-Specify the system assigned identity for the virtual machine.
+Specify the system-assigned identity for the virtual machine.
 
 ```yaml
 Type: System.Management.Automation.SwitchParameter
@@ -89,7 +89,7 @@ Accept wildcard characters: False
 ```
 
 ### -DefaultProfile
-The credentials, account, tenant, and subscription used for communication with azure.
+The credentials, account, tenant, and subscription used for communication with Azure.
 
 ```yaml
 Type: Microsoft.Azure.Commands.Common.Authentication.Abstractions.Core.IAzureContextContainer
@@ -104,7 +104,7 @@ Accept wildcard characters: False
 ```
 
 ### -Id
-Specifies the Resource ID of the virtual machine.
+Specifies the resource ID of the virtual machine.
 
 ```yaml
 Type: System.String
@@ -119,8 +119,8 @@ Accept wildcard characters: False
 ```
 
 ### -IdentityId
-Specifies the list of user identities associated with the virtual machine scale set.
-The user identity references will be ARM resource ids in the form: '/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.ManagedIdentity/identities/{identityName}'
+Specifies the list of user identities associated with the virtual machine.
+The user identity references will be ARM resource IDs in the form: '/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.ManagedIdentity/identities/{identityName}'
 
 ```yaml
 Type: System.String[]
@@ -135,7 +135,7 @@ Accept wildcard characters: False
 ```
 
 ### -IdentityType
-The type of identity used for the virtual machine. Currently, the only supported type is 'SystemAssigned', which implicitly creates an identity.
+The type of identity used for the virtual machine. Valid values are SystemAssigned, UserAssigned, SystemAssignedUserAssigned, and None.
 
 ```yaml
 Type: System.Nullable`1[Microsoft.Azure.Management.Compute.Models.ResourceIdentityType]