add

Author: SevenEarth

website/docs/index.html.markdown

@@ -254,7 +254,7 @@ provider "tencentcloud" {
 
 ### Cam role name
 
-If provided with a Cam role name, Terraform will just access the metadata URL: [Cam security credentials](http://metadata.tencentyun.com/latest/meta-data/cam/security-credentials/<cam_role_name>) to obtain the STS credential. The CVM Instance Role also can be set using the `TENCENTCLOUD_CAM_ROLE_NAME` environment variables.
+If provided with a Cam role name, Terraform will just access the metadata URL: `http://metadata.tencentyun.com/latest/meta-data/cam/security-credentials/<cam_role_name>` to obtain the STS credential. The CVM Instance Role also can be set using the `TENCENTCLOUD_CAM_ROLE_NAME` environment variables.
 
 -> **Note:** Cam-role-name is used to grant the role entity the permissions to access services and resources and perform operations in Tencent Cloud. You can associate the CAM role with a CVM instance to call other Tencent Cloud APIs from the instance using the periodically updated temporary Security Token Service (STS) key.