Update api documentation for the Spamcheck endpoint URL scheme

doc/api/settings.md

@@ -405,9 +405,9 @@ listed in the descriptions of the relevant settings.
 | `sourcegraph_enabled`                    | boolean          | no                                   | Enables Sourcegraph integration. Default is `false`. **If enabled, requires** `sourcegraph_url`. |
 | `sourcegraph_public_only`                | boolean          | no                                   | Blocks Sourcegraph from being loaded on private and internal projects. Default is `true`. |
 | `sourcegraph_url`                        | string           | required by: `sourcegraph_enabled`   | The Sourcegraph instance URL for integration. |
-| `spam_check_endpoint_enabled`            | boolean          | no                                   | Enables Spam Check via external API endpoint. Default is `false`. |
-| `spam_check_endpoint_url`                | string           | no                                   | URL of the external Spam Check service endpoint. |
-| `spam_check_api_key`                      | string           | no                                   | The API key used by GitLab for accessing the Spam Check service endpoint. |
+| `spam_check_endpoint_enabled`            | boolean          | no                                   | Enables spam checking via external Spamcheck API endpoint. Default is `false`. |
+| `spam_check_endpoint_url`                | string           | no                                   | URL of the external Spamcheck service endpoint. This must use a URI scheme of either "grpc" or "tls". Specifying a "tls" scheme will force communication to be encrypted.|
+| `spam_check_api_key`                      | string           | no                                   | The API key used by GitLab for accessing the Spamcheck service endpoint. |
 | `suggest_pipeline_enabled`               | boolean          | no                                   | Enable pipeline suggestion banner. |
 | `terminal_max_session_time`              | integer          | no                                   | Maximum time for web terminal websocket connection (in seconds). Set to `0` for unlimited time. |
 | `terms`                                  | text             | required by: `enforce_terms`         | (**Required by:** `enforce_terms`) Markdown content for the ToS. |