Update REST doc SAMI

Author: jess-hu-340

articles/data-factory/connector-rest.md

@@ -38,7 +38,7 @@ For a list of data stores that are supported as sources/sinks, see [Supported da
 Specifically, this generic REST connector supports:
 
 - Copying data from a REST endpoint by using the **GET** or **POST** methods and copying data to a REST endpoint by using the **POST**, **PUT** or **PATCH** methods.
-- Copying data by using one of the following authentications: **Anonymous**, **Basic**, **Service Principal**, and **user-assigned managed identity**.
+- Copying data by using one of the following authentications: **Anonymous**, **Basic**, **Service Principal**, **OAuth2 Client Credential**, **System Assigned Managed Identity** and **User Assigned Managed Identity**.
 - **[Pagination](#pagination-support)** in the REST APIs.
 - For REST as source, copying the REST JSON response [as-is](#export-json-response-as-is) or parse it by using [schema mapping](copy-activity-schema-and-type-mapping.md#schema-mapping). Only response payload in **JSON** is supported.
 
@@ -96,6 +96,7 @@ For different authentication types, see the corresponding sections for details.
 - [Basic authentication](#use-basic-authentication)
 - [Service Principal authentication](#use-service-principal-authentication)
 - [OAuth2 Client Credential authentication](#use-oauth2-client-credential-authentication)
+- [System-assigned managed identity authentication](#managed-identity)
 - [User-assigned managed identity authentication](#use-user-assigned-managed-identity-authentication)
 - [Anonymous authentication](#using-authentication-headers)
 
@@ -132,33 +133,6 @@ Set the **authenticationType** property to **Basic**. In addition to the generic
 }
 ```
 
-### <a name="managed-identity"></a> Use system-assigned managed identity authentication
-
-Set the **authenticationType** property to **ManagedServiceIdentity**. In addition to the generic properties that are described in the preceding section, specify the following properties:
-
-| Property | Description | Required |
-|:--- |:--- |:--- |
-| aadResourceId | Specify the AAD resource you are requesting for authorization, for example, `https://management.core.windows.net`.| Yes |
-
-**Example**
-
-```json
-{
-    "name": "RESTLinkedService",
-    "properties": {
-        "type": "RestService",
-        "typeProperties": {
-            "url": "<REST endpoint e.g. https://www.example.com/>",
-            "authenticationType": "ManagedServiceIdentity",
-            "aadResourceId": "<AAD resource URL e.g. https://management.core.windows.net>"
-        },
-        "connectVia": {
-            "referenceName": "<name of Integration Runtime>",
-            "type": "IntegrationRuntimeReference"
-        }
-    }
-}
-```
 
 ### Use Service Principal authentication
 
@@ -233,6 +207,34 @@ Set the **authenticationType** property to **OAuth2ClientCredential**. In additi
 }
 ```
 
+### <a name="managed-identity"></a> Use system-assigned managed identity authentication
+
+Set the **authenticationType** property to **ManagedServiceIdentity**. In addition to the generic properties that are described in the preceding section, specify the following properties:
+
+| Property | Description | Required |
+|:--- |:--- |:--- |
+| aadResourceId | Specify the AAD resource you are requesting for authorization, for example, `https://management.core.windows.net`.| Yes |
+
+**Example**
+
+```json
+{
+    "name": "RESTLinkedService",
+    "properties": {
+        "type": "RestService",
+        "typeProperties": {
+            "url": "<REST endpoint e.g. https://www.example.com/>",
+            "authenticationType": "ManagedServiceIdentity",
+            "aadResourceId": "<AAD resource URL e.g. https://management.core.windows.net>"
+        },
+        "connectVia": {
+            "referenceName": "<name of Integration Runtime>",
+            "type": "IntegrationRuntimeReference"
+        }
+    }
+}
+```
+
 ### Use user-assigned managed identity authentication
 Set the **authenticationType** property to **ManagedServiceIdentity**. In addition to the generic properties that are described in the preceding section, specify the following properties: