add documentation about PATCH/DELETE methods (#3955) (#2464)

Signed-off-by: Modular Magician <[email protected]>

Author: modular-magician

.changelog/3955.txt

@@ -0,0 +1,3 @@
+```release-note:none
+
+```

website/docs/r/iap_brand.html.markdown

@@ -27,11 +27,17 @@ programatically via API. To convert it into an external brands
 please use the GCP Console.
 
 
-~> **Note:** Brands can be created only once for a Google Cloud Platform
-project and cannot be deleted. Destroying a Terraform-managed Brand
-will remove it from state but *will not delete the resource on the server.*
+~> **Note:** Brands can only be created once for a Google Cloud 
+project and the underlying Google API doesn't not support DELETE or PATCH methods. 
+Destroying a Terraform-managed Brand will remove it from state 
+but *will not delete it from Google Cloud.*
 
 
+To get more information about Brand, see:
+
+* [API documentation](https://cloud.google.com/iap/docs/reference/rest/v1/projects.brands)
+* How-to Guides
+    * [Setting up IAP Brand](https://cloud.google.com/iap/docs/tutorial-gce#set_up_iap)
 
 ## Example Usage - Iap Brand
 

website/docs/r/iap_client.html.markdown

@@ -29,6 +29,11 @@ manually created via the GCP console. This restriction is due to the existing AP
 in this tool.
 
 
+To get more information about Client, see:
+
+* [API documentation](https://cloud.google.com/iap/docs/reference/rest/v1/projects.brands.identityAwareProxyClients)
+* How-to Guides
+    * [Setting up IAP Client](https://cloud.google.com/iap/docs/authentication-howto)
 
 ~> **Warning:** All arguments including `secret` will be stored in the raw
 state as plain-text. [Read more about sensitive data in state](/docs/state/sensitive-data.html).