Remove undefined from docs

doc/api/vulnerability_findings.md

@@ -47,15 +47,15 @@ GET /projects/:id/vulnerability_findings?pipeline_id=42
 ```
 
 CAUTION: **Deprecation:**
-Beginning with GitLab 12.9, the `undefined` severity level is deprecated and the `undefined` confidence level isn't reported for new vulnerabilities.
+Beginning with GitLab 12.9, the `undefined` severity and confidence level is no longer reported.
 
 | Attribute     | Type           | Required | Description                                                                                                                                                                         |
 | ------------- | -------------- | -------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
 | `id`          | integer/string | yes      | The ID or [URL-encoded path of the project](README.md#namespaced-path-encoding) which the authenticated user is a member of.                                                        |
 | `report_type` | string array   | no       | Returns vulnerability findings belonging to specified report type. Valid values: `sast`, `dast`, `dependency_scanning`, or `container_scanning`. Defaults to all.                   |
 | `scope`       | string         | no       | Returns vulnerability findings for the given scope: `all` or `dismissed`. Defaults to `dismissed`.                                                                                  |
-| `severity`    | string array   | no       | Returns vulnerability findings belonging to specified severity level: `undefined`, `info`, `unknown`, `low`, `medium`, `high`, or `critical`. Defaults to all.                      |
-| `confidence`  | string array   | no       | Returns vulnerability findings belonging to specified confidence level: `undefined`, `ignore`, `unknown`, `experimental`, `low`, `medium`, `high`, or `confirmed`. Defaults to all. |
+| `severity`    | string array   | no       | Returns vulnerability findings belonging to specified severity level: `info`, `unknown`, `low`, `medium`, `high`, or `critical`. Defaults to all.                                   |
+| `confidence`  | string array   | no       | Returns vulnerability findings belonging to specified confidence level: `ignore`, `unknown`, `experimental`, `low`, `medium`, `high`, or `confirmed`. Defaults to all.              |
 | `pipeline_id` | integer/string | no       | Returns vulnerability findings belonging to specified pipeline.                                                                                                                     |
 
 ```shell