[7.17] [DOCS] Clarify xpack.actions.enabledActionTypes (#191772) (#19…

…1857)

# Backport

This will backport the following commits from `main` to `7.17`:
- [[DOCS] Clarify xpack.actions.enabledActionTypes
(#191772)](#191772)

<!--- Backport version: 8.9.8 -->

### Questions ?
Please refer to the [Backport tool
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Clarify xpack.actions.enabledActionTypes
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Clarify xpack.actions.enabledActionTypes
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BACKPORT-->

### Preview


https://kibana_bk_191857.docs-preview.app.elstc.co/guide/en/kibana/7.17/alert-action-settings-kb.html

docs/settings/alert-action-settings.asciidoc

@@ -138,8 +138,12 @@ WARNING: This feature is available in {kib} 7.17.4 and 8.3.0 onwards but is not
 `xpack.actions.enabledActionTypes` {ess-icon}::
 A list of action types that are enabled. It defaults to `[*]`, enabling all types. The names for built-in {kib} action types are prefixed with a `.` and include: `.email`, `.index`, `.jira`, `.pagerduty`, `.resilient`, `.server-log`, `.servicenow`, .`servicenow-itom`, `.servicenow-sir`, `.slack`, `.swimlane`, `.teams`, and `.webhook`. An empty list `[]` will disable all action types.
 +
+--
 Disabled action types will not appear as an option when creating new connectors, but existing connectors and actions of that type will remain in {kib} and will not function.
 
+IMPORTANT: <<pre-configured-connectors,Preconfigured connectors>> are not affected by this setting.
+--
+
 `xpack.actions.preconfiguredAlertHistoryEsIndex` {ess-icon}::
 Enables a preconfigured alert history {es} <<index-action-type, Index>> connector. Default: `false`.