Document _IMAGE_SUFFIX variable for API Security

doc/user/application_security/api_fuzzing/index.md

@@ -586,7 +586,8 @@ profile increases as the number of tests increases.
 | CI/CD variable                                              | Description |
 |-------------------------------------------------------------|-------------|
 | `SECURE_ANALYZERS_PREFIX`                                   | Specify the Docker registry base address from which to download the analyzer. |
-| `FUZZAPI_VERSION`                                           | Specify API Fuzzing container version. Defaults to `latest`. |
+| `FUZZAPI_VERSION`                                           | Specify API Fuzzing container version. Defaults to `1`. |
+| `FUZZAPI_IMAGE_SUFFIX`                                      | Specify a container image suffix. Defaults to none. |
 | `FUZZAPI_TARGET_URL`                                        | Base URL of API testing target. |
 | `FUZZAPI_CONFIG`                                            | [Deprecated](https://gitlab.com/gitlab-org/gitlab/-/issues/276395) in GitLab 13.12, replaced with default `.gitlab/gitlab-api-fuzzing-config.yml`. API Fuzzing configuration file. |
 |[`FUZZAPI_PROFILE`](#api-fuzzing-profiles)                   | Configuration profile to use during testing. Defaults to `Quick-10`. |

doc/user/application_security/dast_api/index.md

@@ -537,7 +537,9 @@ can be added, removed, and modified by creating a custom configuration.
 
 | CI/CD variable                                       | Description        |
 |------------------------------------------------------|--------------------|
-| `DAST_API_VERSION`                                    | Specify DAST API container version. Defaults to `latest`. |
+| `SECURE_ANALYZERS_PREFIX`                            | Specify the Docker registry base address from which to download the analyzer. |
+| `DAST_API_VERSION`                                   | Specify DAST API container version. Defaults to `1`. |
+| `DAST_API_IMAGE_SUFFIX`                              | Specify a container image suffix. Defaults to none. |
 | `DAST_API_TARGET_URL`                                 | Base URL of API testing target. |
 |[`DAST_API_CONFIG`](#configuration-files)              | DAST API configuration file. Defaults to `.gitlab-dast-api.yml`. |
 |[`DAST_API_PROFILE`](#configuration-files)             | Configuration profile to use during testing. Defaults to `Quick`. |