doc/api/projects: Document confidential_note_events parameter

doc/api/projects.md

@@ -1943,6 +1943,7 @@ GET /projects/:id/hooks/:hook_id
   "merge_requests_events": true,
   "tag_push_events": true,
   "note_events": true,
+  "confidential_note_events": true,
   "job_events": true,
   "pipeline_events": true,
   "wiki_page_events": true,
@@ -1970,6 +1971,7 @@ POST /projects/:id/hooks
 | `merge_requests_events` | boolean | no | Trigger hook on merge requests events |
 | `tag_push_events` | boolean | no | Trigger hook on tag push events |
 | `note_events` | boolean | no | Trigger hook on note events |
+| `confidential_note_events` | boolean | no | Trigger hook on confidential note events |
 | `job_events` | boolean | no | Trigger hook on job events |
 | `pipeline_events` | boolean | no | Trigger hook on pipeline events |
 | `wiki_page_events` | boolean | no | Trigger hook on wiki events |
@@ -1996,6 +1998,7 @@ PUT /projects/:id/hooks/:hook_id
 | `merge_requests_events` | boolean | no | Trigger hook on merge requests events |
 | `tag_push_events` | boolean | no | Trigger hook on tag push events |
 | `note_events` | boolean | no | Trigger hook on note events |
+| `confidential_note_events` | boolean | no | Trigger hook on confidential note events |
 | `job_events` | boolean | no | Trigger hook on job events |
 | `pipeline_events` | boolean | no | Trigger hook on pipeline events |
 | `wiki_events` | boolean | no | Trigger hook on wiki events |