Add environment variables to cloud descriptions

website/content/docs/agent/config/config-files.mdx

@@ -1088,21 +1088,15 @@ Refer to the [formatting specification](https://golang.org/pkg/time/#ParseDurati
 
 - `bootstrap_expect` Equivalent to the [`-bootstrap-expect` command-line flag](/consul/docs/agent/config/cli-flags#_bootstrap_expect).
 
-## HCP Parameters
+## Self-managed HCP Parameters
 
-- `cloud` This object specifies settings for connecting to HCP. This was added in Consul 1.14
+- `cloud` This object specifies settings for connecting self-managed clusters to HCP. This was added in Consul 1.14
 
-  - `client_id` The OAuth2 client ID for authentication with HCP
+  - `client_id` The OAuth2 client ID for authentication with HCP. This can be overridden using the `HCP_CLIENT_ID` environment variable.
 
-  - `client_secret` The OAuth2 client secret for authentication with HCP
+  - `client_secret` The OAuth2 client secret for authentication with HCP. This can be overridden using the `HCP_CLIENT_SECRET` environment variable.
 
-  - `resource_id` The HCP resource identifier
-
-  - `hostname` (optional) The HCP hostname
-
-  - `auth_url` (optional) The HCP authentication URL
-
-  - `scada_address` (optional) The HCP SCADA address
+  - `resource_id` The HCP resource identifier. This can be overridden using the `HCP_RESOURCE_ID` environment variable.
 
 ## Service Mesh Parameters ((#connect-parameters))