docs: update IMDSv2 doc for ecs ram role

README-zh-CN.md

@@ -113,12 +113,15 @@ $ramRoleArn->getPolicy();
 
 use AlibabaCloud\Credentials\Credential;
 
-$ecsRamRole = new Credential([
-    'type'      => 'ecs_ram_role',
-    'role_name' => '<role_name>',
+$config = new Credential\Config([
+    'type'         => 'ecs_ram_role',
+    'roleName'     => '<role_name>',
+    'enableIMDSv2' => true,
 ]);
+$ecsRamRole = new Credential($config);
 $ecsRamRole->getRoleName();
-// Note: `role_name` is optional. It will be retrieved automatically if not set. It is highly recommended to set it up to reduce requests.
+// Note: `roleName` is optional. It will be retrieved automatically if not set. It is highly recommended to set it up to reduce requests.
+// Note: `enableIMDSv2` is optional and is recommended to be turned on. It can be replaced by setting environment variable: ALIBABA_CLOUD_ECS_IMDSV2_ENABLE
 ```
 
 #### RsaKeyPair

README.md

@@ -113,12 +113,15 @@ By specifying the role name, the credential will be able to automatically reques
 
 use AlibabaCloud\Credentials\Credential;
 
-$ecsRamRole = new Credential([
-    'type'      => 'ecs_ram_role',
-    'role_name' => '<role_name>',
+$config = new Credential\Config([
+    'type'         => 'ecs_ram_role',
+    'roleName'     => '<role_name>',
+    'enableIMDSv2' => true,
 ]);
+$ecsRamRole = new Credential($config);
 $ecsRamRole->getRoleName();
-// Note: `role_name` is optional. It will be retrieved automatically if not set. It is highly recommended to set it up to reduce requests.
+// Note: `roleName` is optional. It will be retrieved automatically if not set. It is highly recommended to set it up to reduce requests.
+// Note: `enableIMDSv2` is optional and is recommended to be turned on. It can be replaced by setting environment variable: ALIBABA_CLOUD_ECS_IMDSV2_ENABLE
 ```
 
 #### RsaKeyPair

tests/Feature/CredentialTest.php

@@ -46,14 +46,16 @@ public function testAccessKey()
     public function testEcsRamRoleCredential()
     {
         $config     = new Credential\Config([
-            'type'     => 'ecs_ram_role',
-            'roleName' => 'foo',
+            'type'         => 'ecs_ram_role',
+            'roleName'     => 'foo',
+            'enableIMDSv2' => true,
         ]);
         $credential = new Credential($config);
 
         // Assert
         $this->assertEquals('foo', $credential->getRoleName());
         $this->assertEquals('ecs_ram_role', $credential->getType());
+        $this->assertTrue($credential['enableIMDSv2']);
         $credential->getAccessKeySecret();
     }