update doc

Author: mikatong

tencentcloud/services/cynosdb/resource_tc_cynosdb_ssl.md

@@ -8,4 +8,12 @@ resource "tencentcloud_cynosdb_ssl" "cynosdb_ssl" {
   instance_id = "cynosdbmysql-ins-pfsv6q1e"
   status = "ON"
 }
+```
+
+Import
+
+cynosdb ssl can be imported using the id, e.g.
+
+```
+terraform import tencentcloud_cynosdb_ssl.cynosdb_ssl ${cluster_id}#${instance_id}
 ```

website/docs/r/cynosdb_ssl.html.markdown

@@ -37,3 +37,11 @@ In addition to all arguments above, the following attributes are exported:
 * `download_url` - Certificate download address.
 
 
+## Import
+
+cynosdb ssl can be imported using the id, e.g.
+
+```
+terraform import tencentcloud_cynosdb_ssl.cynosdb_ssl ${cluster_id}#${instance_id}
+```
+