Updated Resources and Cmdlet documentation pages

docs/docs/resources/azure-ad/AADExternalIdentityPolicy.md

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+# AADExternalIdentityPolicy
+
+## Parameters
+
+| Parameter | Attribute | DataType | Description | Allowed Values |
+| --- | --- | --- | --- | --- |
+| **IsSingleInstance** | Key | String | Only valid value is 'Yes'. | `Yes` |
+| **AllowDeletedIdentitiesDataRemoval** | Write | Boolean | Reserved for future use. | |
+| **allowExternalIdentitiesToLeave** | Required | Boolean | Defines whether external users can leave the guest tenant. If set to false, self-service controls are disabled, and the admin of the guest tenant must manually remove the external user from the guest tenant. When the external user leaves the tenant, their data in the guest tenant is first soft-deleted then permanently deleted in 30 days. | |
+| **Credential** | Write | PSCredential | Credentials for the Microsoft Graph delegated permissions. | |
+| **ApplicationId** | Write | String | Id of the Azure Active Directory application to authenticate with. | |
+| **TenantId** | Write | String | Id of the Azure Active Directory tenant used for authentication. | |
+| **ApplicationSecret** | Write | PSCredential | Secret of the Azure Active Directory application to authenticate with. | |
+| **CertificateThumbprint** | Write | String | Thumbprint of the Azure Active Directory application's authentication certificate to use for authentication. | |
+| **ManagedIdentity** | Write | Boolean | Managed ID being used for authentication. | |
+
+## Description
+
+Represents the tenant-wide policy that controls whether external users can leave the guest Microsoft Entra tenant via self-service controls.
+
+## Permissions
+
+### Microsoft Graph
+
+To authenticate with the Microsoft Graph API, this resource required the following permissions:
+
+#### Delegated permissions
+
+- **Read**
+
+    - None
+
+- **Update**
+
+    - None
+
+#### Application permissions
+
+- **Read**
+
+    - Policy.Read.All
+
+- **Update**
+
+    - Policy.ReadWrite.ExternalIdentities
+
+## Examples
+
+### Example 1
+
+This example is used to test new resources and showcase the usage of new resources being worked on.
+It is not meant to use as a production baseline.
+
+```powershell
+Configuration Example
+{
+    param
+    (
+        [Parameter(Mandatory = $true)]
+        [PSCredential]
+        $credsAdmin
+    )
+
+    Import-DscResource -ModuleName Microsoft365DSC
+
+    node localhost
+    {
+        AADExternalIdentityPolicy "AADExternalIdentityPolicy"
+        {
+            AllowDeletedIdentitiesDataRemoval = $False;
+            AllowExternalIdentitiesToLeave    = $True;
+            Credential                        = $CredsAdmin;
+            IsSingleInstance                  = "Yes";
+        }
+    }
+}
+```
+