fix(cvm): [126452417] tencentcloud_instance update doc (#3480)

* add

* add

Author: SevenEarth

.changelog/3480.txt

@@ -0,0 +1,3 @@
+```release-note:enhancement
+resource/tencentcloud_instance: update doc
+```

tencentcloud/services/cvm/resource_tc_instance.md

@@ -10,6 +10,8 @@ Provides a CVM instance resource.
 
 ~> **NOTE:** It is recommended to use resource `tencentcloud_eip` to create a AntiDDos Eip, and then call resource `tencentcloud_eip_association` to bind it to resource `tencentcloud_instance`.
 
+~> **NOTE:** When creating a prepaid CVM instance and binding a data disk, you need to explicitly set `delete_with_instance` to `false`.
+
 Example Usage
 
 Create a general POSTPAID_BY_HOUR CVM instance

website/docs/r/instance.html.markdown

@@ -21,6 +21,8 @@ Provides a CVM instance resource.
 
 ~> **NOTE:** It is recommended to use resource `tencentcloud_eip` to create a AntiDDos Eip, and then call resource `tencentcloud_eip_association` to bind it to resource `tencentcloud_instance`.
 
+~> **NOTE:** When creating a prepaid CVM instance and binding a data disk, you need to explicitly set `delete_with_instance` to `false`.
+
 ## Example Usage
 
 ### Create a general POSTPAID_BY_HOUR CVM instance