docs: add ELEMENTARY_ENV_ID to secrets tables, clarify optional fields

Author: joostboon

docs/cloud/features/ci.mdx

@@ -73,9 +73,10 @@ When a PR is opened or updated:
   <Step title="Add a repository secret">
     Go to **Settings > Secrets and variables > Actions** in your GitHub repository and add:
 
-    | Secret | Description |
-    |---|---|
-    | `ELEMENTARY_API_KEY` | Your Elementary Cloud API key |
+    | Secret | Required | Description |
+    |---|---|---|
+    | `elementary_api_key` | Yes | Your Elementary Cloud API key |
+    | `elementary_env_id` | No | Your Elementary environment ID. Only needed when the repository is connected to multiple environments. |
 
     The review only runs on PRs that touch model files. Other PRs are ignored.
 
@@ -85,15 +86,7 @@ When a PR is opened or updated:
   </Step>
 </Steps>
 
-<AccordionGroup>
-  <Accordion title="Optional: customize the action">
-
-  | Input | Default | Description |
-  |---|---|---|
-  | `elementary-api-url` | Elementary Cloud | Override the API URL. Only needed for self-hosted Elementary setups |
-
-  </Accordion>
-  <Accordion title="Optional: specify environment">
+<Accordion title="Optional: specify environment">
 
   If your repository is connected to multiple Elementary environments, add `env-id` to specify which one to use:
 
@@ -123,10 +116,11 @@ When a PR is opened or updated:
   <Step title="Add CI/CD variables">
     Go to **Settings > CI/CD > Variables** and add:
 
-    | Variable | Masked | Description |
-    |---|---|---|
-    | `ELEMENTARY_API_KEY` | Yes | Your Elementary Cloud API key |
-    | `GITLAB_API_TOKEN` | Yes | Optional. Project Access Token with `api` scope. Set this if you cannot enable CI/CD job token API access in project settings. |
+    | Variable | Masked | Required | Description |
+    |---|---|---|---|
+    | `elementary_api_key` | Yes | Yes | Your Elementary Cloud API key |
+    | `elementary_env_id` | Yes | No | Your Elementary environment ID. Only needed when the repository is connected to multiple environments. |
+    | `gitlab_api_token` | Yes | No | Project Access Token with `api` scope. Only needed if you cannot enable CI/CD job token access (see below). |
 
     To post the MR comment, the template uses one of two authentication methods: