[DOCS] Adding authorization_realms setting for OIDC (#64877)

* Adding authorization_realms setting for OIDC.

* Fix typo

* Splitting note into separate notes.

docs/reference/settings/security-settings.asciidoc

@@ -1614,6 +1614,13 @@ File-based resources are polled at a frequency determined by the global {es}
 `resource.reload.interval.high` setting, which defaults to 5 seconds.
 // end::oidc-op-jwkset-path-tag[]
 
+`authorization_realms`::
+(<<static-cluster-setting,Static>>)
+The names of the realms that should be consulted for delegated authorization.
+If this setting is used, then the OpenID Connect realm does not perform role
+mapping and instead loads the user from the listed realms.
+See <<authorization_realms>>.
+
 // tag::rp-client-id-tag[]
 `rp.client_id` {ess-icon}::
 (<<static-cluster-setting,Static>>)

x-pack/docs/en/security/authentication/oidc-guide.asciidoc

@@ -483,12 +483,13 @@ If your users also exist in a repository that can be directly accessed by {es}
 <<authorization_realms, authorization realms>> instead of role mappings.
 
 In this case, you perform the following steps:
+
 1. In your OpenID Connect realm, assign a claim to act as the lookup userid,
    by configuring the `claims.principal` setting.
-2. Create a new realm that can lookup users from your local repository (e.g. an
+2. Create a new realm that can look up users from your local repository (e.g. an
    `ldap` realm)
-3. In your OpenID Connect realm, set `authorization_realms` to the name of the realm you
-   created in step 2.
+3. In your OpenID Connect realm, set `authorization_realms` to the name of the
+realm you created in step 2.
 
 [[oidc-user-metadata]]
 === User metadata

x-pack/docs/en/security/authorization/mapping-roles.asciidoc

@@ -10,6 +10,9 @@ For other types of realms, you must create _role-mappings_ that define which
 roles should be assigned to each user based on their username, groups, or
 other metadata.
 
+NOTE: When <<anonymous-access,anonymous access>> is enabled, the roles
+of the anonymous user are assigned to all the other users as well.
+
 You can define role-mappings via an
 <<mapping-roles-api, API>> or manage them through <<mapping-roles-file, files>>.
 These two sources of role-mapping are combined inside of the {es}
@@ -17,6 +20,8 @@ These two sources of role-mapping are combined inside of the {es}
 possible for a single user to have some roles that have been mapped through
 the API, and other roles that are mapped through files.
 
+NOTE: Users with no roles assigned will be unauthorized for any action.
+
 When you use role-mappings, you assign existing roles to users.
 The available roles should either be added using the
 <<security-role-apis,role management APIs>> or defined in the
@@ -25,14 +30,9 @@ either role management method. For example, when you use the role mapping API,
 you are able to map users to both API-managed roles and file-managed roles
 (and likewise for file-based role-mappings).
 
-NOTE: The PKI, LDAP, Kerberos and SAML realms support using
+TIP: The PKI, LDAP, Kerberos, OpenID Connect, and SAML realms support using
 <<authorization_realms,authorization realms>> as an alternative to role mapping.
 
-NOTE: When <<anonymous-access,anonymous access>> is enabled, the roles
-of the anonymous user are assigned to all the other users as well.
-
-NOTE: Users with no roles assigned will be unauthorized for any action.
-
 [[mapping-roles-api]]
 ==== Using the role mapping API
 
@@ -49,10 +49,10 @@ this.
 By default, role mappings are stored in `ES_PATH_CONF/role_mapping.yml`,
 where `ES_PATH_CONF` is `ES_HOME/config` (zip/tar installations) or
 `/etc/elasticsearch` (package installations). To specify a different location,
-you configure the `files.role_mapping` setting in the 
-<<ref-ad-settings,Active Directory>>, 
-<<ref-ldap-settings,LDAP>>, and 
-<<ref-pki-settings,PKI>> realm settings in 
+you configure the `files.role_mapping` setting in the
+<<ref-ad-settings,Active Directory>>,
+<<ref-ldap-settings,LDAP>>, and
+<<ref-pki-settings,PKI>> realm settings in
 `elasticsearch.yml`.
 
 Within the role mapping file, the security roles are keys and groups and users
@@ -67,9 +67,9 @@ this is a common setting in Elasticsearch, changing its value might effect other
 schedules in the system.
 
 While the _role mapping APIs_ is the preferred way to manage role mappings, using
-the `role_mappings.yml` file becomes useful in a couple of use cases: 
+the `role_mappings.yml` file becomes useful in a couple of use cases:
 
-. If you want to define fixed role mappings that no one (besides an administrator 
+. If you want to define fixed role mappings that no one (besides an administrator
 with physical access to the {es} nodes) would be able to change.
 
 . If cluster administration depends on users from external realms and these users
@@ -82,7 +82,7 @@ as a minimal administrative function and is not intended to cover and be used to
 define roles for all use cases.
 
 IMPORTANT: You cannot view, edit, or remove any roles that are defined in the role
-mapping files by using the role mapping APIs. 
+mapping files by using the role mapping APIs.
 
 ==== Realm specific details
 [discrete]