Merge branch 'docs-fix-param-typo' into 'master'

Typo in parameter name for services API endpoint

See merge request gitlab-org/gitlab!43844

doc/api/services.md

@@ -714,7 +714,7 @@ Parameters:
 | `merge_requests_events` | boolean | false | Enable notifications for merge request events |
 | `tag_push_events` | boolean | false | Enable notifications for tag push events |
 | `note_events` | boolean | false | Enable notifications for note events |
-| `confidental_note_events` | boolean | false | Enable notifications for confidential note events |
+| `confidential_note_events` | boolean | false | Enable notifications for confidential note events |
 | `pipeline_events` | boolean | false | Enable notifications for pipeline events |
 
 ### Delete HipChat service