[8.6] [DOCS] Clarify preconfigured connectors (#149904) (#149965)

# Backport

This will backport the following commits from `main` to `8.6`:
- [[DOCS] Clarify preconfigured connectors
(#149904)](#149904)

<!--- Backport version: 8.9.7 -->

### Questions ?
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Clarify preconfigured connectors
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Clarify preconfigured connectors
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Clarify preconfigured connectors
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docs/management/action-types.asciidoc

@@ -141,6 +141,9 @@ image::images/connector-select-type.png[Connector select type]
 After you create a connector, it is available for use any time you set up an
 action in the current space.
 
+For out-of-the-box and standardized connectors, refer to
+<<pre-configured-connectors,preconfigured connectors>>.
+
 [float]
 [[importing-and-exporting-connectors]]
 === Importing and exporting connectors
@@ -157,13 +160,6 @@ button appears in *{connectors-ui}*.
 [role="screenshot"]
 image::images/connectors-with-missing-secrets.png[Connectors with missing secrets]
 
-[float]
-[[create-connectors]]
-=== Preconfigured connectors
-
-For out-of-the-box and standardized connectors, you can <<preconfigured-connector-example, preconfigure connectors>>
-before {kib} starts.
-
 [float]
 [[montoring-connectors]]
 === Monitoring connectors

docs/management/connectors/index.asciidoc

@@ -15,4 +15,5 @@ include::action-types/tines.asciidoc[leveloffset=+1]
 include::action-types/webhook.asciidoc[]
 include::action-types/cases-webhook.asciidoc[leveloffset=+1]
 include::action-types/xmatters.asciidoc[]
-include::pre-configured-connectors.asciidoc[]
+include::pre-configured-connectors.asciidoc[leveloffset=+1]
+

docs/management/connectors/pre-configured-connectors.asciidoc

@@ -1,24 +1,28 @@
-[role="xpack"]
 [[pre-configured-connectors]]
-=== Preconfigured connectors
+== Preconfigured connectors
 
-You can preconfigure a connector to have all the information it needs prior to 
-startup by adding it to the `kibana.yml` file.
+If you are running {kib} on-prem, you can preconfigure a connector to have all
+the information it needs prior to startup by adding it to the `kibana.yml` file.
+
+NOTE: {ess} provides a preconfigured email connector but you cannot create
+additional preconfigured connectors.
 
 Preconfigured connectors offer the following benefits:
 
-- Require no setup. Configuration and credentials needed to execute an
-action are predefined, including the connector name and ID.
+- Require no setup. Configuration and credentials needed to run an action are
+predefined, including the connector name and ID.
 - Appear in all spaces because they are not saved objects.
 - Cannot be edited or deleted.
 
 [float]
-[[preconfigured-connector-example]]
-==== Preconfigured connectors example
+[[create-preconfigured-connectors]]
+=== Create preconfigured connectors
+
+Add `xpack.actions.preconfigured` settings to your `kibana.yml` file. The
+settings vary depending on which type of connector you're adding.
 
-This example shows a valid configuration for
-two out-of-the box connectors: <<slack-action-type, Slack>> and 
-<<webhook-action-type, Webhook>>.
+This example shows a valid configuration for a Slack connector and a Webhook
+connector:
 
 ```js
   xpack.actions.preconfigured:
@@ -50,31 +54,29 @@ two out-of-the box connectors: <<slack-action-type, Slack>> and
 [NOTE]
 ==============================================
 Sensitive properties, such as passwords, can also be stored in the 
-<<creating-keystore, {kib} keystore>>.
+<<creating-keystore,{kib} keystore>>.
 ==============================================
 
 [float]
 [[build-in-preconfigured-connectors]]
-==== Built-in preconfigured connectors
+=== Built-in preconfigured connectors
 
 {kib} provides the following built-in preconfigured connectors:
 
-* <<preconfigured-connector-alert-history, Alert history preconfigured {es} index connector>>
-* <<elasticcloud, `Elastic-Cloud-SMTP` preconfigured email connector>>
+* <<preconfigured-connector-alert-history,Alert history preconfigured {es} index connector>>
+* <<elasticcloud,`Elastic-Cloud-SMTP` preconfigured email connector>>
 
 [float]
 [[managing-pre-configured-connectors]]
-==== View preconfigured connectors
+=== View preconfigured connectors
 
 When you open the main menu, click *{stack-manage-app} > {connectors-ui}*. 
 Preconfigured connectors appear regardless of which space you are 
 in. They are tagged as “preconfigured”, and you cannot delete them.
 
 [role="screenshot"]
-image::images/pre-configured-connectors-managing.png[Connectors managing tab with pre-configured]
+image::images/preconfigured-connectors-managing.png[Connectors managing tab with pre-configured]
 
 Clicking a preconfigured connector shows the description, but not the 
-configuration. A message indicates that this is a preconfigured connector.
+configuration.
 
-[role="screenshot"]
-image::images/pre-configured-connectors-view-screen.png[Pre-configured connector view details]