fix(eip): [126431857] tencentcloud_eip_association update doc for instance_id (#3471)

* add

* add

Author: SevenEarth

.changelog/3471.txt

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

tencentcloud/services/cvm/resource_tc_eip_association.go

@@ -42,7 +42,7 @@ func ResourceTencentCloudEipAssociation() *schema.Resource {
 					"private_ip",
 				},
 				ValidateFunc: tccommon.ValidateStringLengthInRange(1, 25),
-				Description:  "The CVM or CLB instance id going to bind with the EIP. This field is conflict with `network_interface_id` and `private_ip fields`.",
+				Description:  "The CVM, SaaS WAF or CLB instance id going to bind with the EIP. This field is conflict with `network_interface_id` and `private_ip fields`.",
 			},
 			"network_interface_id": {
 				Type:         schema.TypeString,

tencentcloud/services/cvm/resource_tc_eip_association.md

@@ -105,10 +105,19 @@ resource "tencentcloud_eip_association" "example" {
 }
 ```
 
+Bind elastic public IP By WAF(SaaS)
+
+```hcl
+resource "tencentcloud_eip_association" "example" {
+  eip_id      = "eip-4stgtfb8"
+  instance_id = "waf_2opxlbky67yub3gm"
+}
+```
+
 Import
 
 Eip association can be imported using the id, e.g.
 
 ```
-$ terraform import tencentcloud_eip_association.bar eip-41s6jwy4::ins-34jwj3
+$ terraform import tencentcloud_eip_association.example eip-41s6jwy4::ins-0cxjwrog
 ```

website/docs/r/eip_association.html.markdown

@@ -116,12 +116,21 @@ resource "tencentcloud_eip_association" "example" {
 }
 ```
 
+### Bind elastic public IP By WAF(SaaS)
+
+```hcl
+resource "tencentcloud_eip_association" "example" {
+  eip_id      = "eip-4stgtfb8"
+  instance_id = "waf_2opxlbky67yub3gm"
+}
+```
+
 ## Argument Reference
 
 The following arguments are supported:
 
 * `eip_id` - (Required, String, ForceNew) The ID of EIP.
-* `instance_id` - (Optional, String, ForceNew) The CVM or CLB instance id going to bind with the EIP. This field is conflict with `network_interface_id` and `private_ip fields`.
+* `instance_id` - (Optional, String, ForceNew) The CVM, SaaS WAF or CLB instance id going to bind with the EIP. This field is conflict with `network_interface_id` and `private_ip fields`.
 * `network_interface_id` - (Optional, String, ForceNew) Indicates the network interface id like `eni-xxxxxx`. This field is conflict with `instance_id`.
 * `private_ip` - (Optional, String, ForceNew) Indicates an IP belongs to the `network_interface_id`. This field is conflict with `instance_id`.
 
@@ -138,6 +147,6 @@ In addition to all arguments above, the following attributes are exported:
 Eip association can be imported using the id, e.g.
 
 ```
-$ terraform import tencentcloud_eip_association.bar eip-41s6jwy4::ins-34jwj3
+$ terraform import tencentcloud_eip_association.example eip-41s6jwy4::ins-0cxjwrog
 ```