[DOCS] Adds get setting and update settings asciidoc files to security API index (#104916)

* [DOCS] Adds get setting and update settings asciidoc files to security API index.

* [DOCS] Fixes references in docs.

docs/reference/rest-api/security.asciidoc

@@ -188,6 +188,7 @@ include::security/get-role-mappings.asciidoc[]
 include::security/get-roles.asciidoc[]
 include::security/get-service-accounts.asciidoc[]
 include::security/get-service-credentials.asciidoc[]
+include::security/get-settings.asciidoc[]
 include::security/get-tokens.asciidoc[]
 include::security/get-user-privileges.asciidoc[]
 
@@ -202,6 +203,7 @@ include::security/oidc-logout-api.asciidoc[]
 include::security/query-api-key.asciidoc[]
 include::security/query-user.asciidoc[]
 include::security/update-api-key.asciidoc[]
+include::security/update-settings.asciidoc[]
 include::security/bulk-update-api-keys.asciidoc[]
 include::security/saml-prepare-authentication-api.asciidoc[]
 include::security/saml-authenticate-api.asciidoc[]

docs/reference/rest-api/security/get-settings.asciidoc

@@ -5,17 +5,21 @@
 <titleabbrev>Get Security settings</titleabbrev>
 ++++
 
+[[security-api-get-settings-prereqs]]
 ==== {api-prereq-title}
 
 * To use this API, you must have at least the `read_security` cluster privilege.
 
+[[security-api-get-settings-desc]]
 ==== {api-description-title}
-This API allows a user to retrieve the user-configurable settings for the Security internal index (`.security` and associated indices). Only a subset of the index settings — those that are user-configurable—will be shown. This includes:
+This API allows a user to retrieve the user-configurable settings for the 
+Security internal index (`.security` and associated indices). Only a subset of 
+the index settings — those that are user-configurable—will be shown. This includes:
 
 - `index.auto_expand_replicas`
 - `index.number_of_replicas`
 
-An example of retrieving the Security settings:
+An example of retrieving the security settings:
 
 [source,console]
 -----------------------------------------------------------
@@ -24,4 +28,5 @@ GET /_security/settings
 // TEST[setup:user_profiles]
 // TEST[setup:service_token42]
 
-The configurable settings can be modified using the <<security-api-update-settings,Update Security index settings>> API.
+The configurable settings can be modified using the 
+<<security-api-update-settings,Update Security index settings>> API.

docs/reference/rest-api/security/update-settings.asciidoc

@@ -5,12 +5,16 @@
 <titleabbrev>Update Security settings</titleabbrev>
 ++++
 
+[[security-api-update-settings-prereqs]]
 ==== {api-prereq-title}
 
 * To use this API, you must have at least the `manage_security` cluster privilege.
 
+[[security-api-update-settings-desc]]
 ==== {api-description-title}
-This API allows a user to modify the settings for the Security internal indices (`.security` and associated indices). Only a subset of settings are allowed to be modified. This includes:
+This API allows a user to modify the settings for the Security internal indices 
+(`.security` and associated indices). Only a subset of settings are allowed to 
+be modified. This includes:
 
 - `index.auto_expand_replicas`
 - `index.number_of_replicas`
@@ -34,17 +38,23 @@ PUT /_security/settings
 -----------------------------------------------------------
 // TEST[skip:making sure all the indices have been created reliably is difficult]
 
-The configured settings can be retrieved using the <<security-api-get-settings,Get Security index settings>> API. If a
-given index is not in use on the system, but settings are provided for it, the request will be rejected - this API does
-not yet support configuring the settings for these indices before they are in use.
+The configured settings can be retrieved using the 
+<<security-api-get-settings,Get Security index settings>> API. If a given index 
+is not in use on the system, but settings are provided for it, the request will 
+be rejected - this API does not yet support configuring the settings for these 
+indices before they are in use.
+
 
 ==== {api-request-body-title}
+
 `security`::
-(Optional, object) Settings to be used for the index used for most security configuration, including Native realm users
-and roles configured via the API.
+(Optional, object) Settings to be used for the index used for most security 
+configuration, including Native realm users and roles configured via the API.
 
 `security-tokens`::
-(Optional, object) Settings to be used for the index used to store <<tokens,security-api-get-token>>.
+(Optional, object) Settings to be used for the index used to store 
+<<security-api-get-token,tokens>>.
 
 `security`::
-(Optional, object) Settings to be used for the index used to store <<Profile,security-api-activate-user-profile>> information.
+(Optional, object) Settings to be used for the index used to store 
+<<security-api-activate-user-profile, profile>> information.