[DOCS] Fixed broken role mapping link

Original commit: elastic/x-pack-elasticsearch@97b8fae993

docs/en/security/authentication/saml-guide.asciidoc

@@ -614,7 +614,7 @@ PUT /_xpack/security/role_mapping/saml-kibana
 The attributes that are mapped via the realm configuration are used to process
 role mapping rules, and these rules determine which roles a user is granted.
 
-The <<mapping-roles-rule-field, user fields>> that are provided to the role
+The user fields that are provided to the role
 mapping are derived from the SAML attributes as follows:
 
 - `username`: The `principal` attribute
@@ -622,6 +622,9 @@ mapping are derived from the SAML attributes as follows:
 - `groups`: The `groups` attribute
 - `metadata`: See <<saml-user-metadata>>
 
+For more information, see <<mapping-roles>> and
+{ref}/security-api-role-mapping.html[Role Mapping APIs]. 
+
 If your IdP has the ability to provide groups or roles to Service Providers,
 then you should map this SAML attribute to the `attributes.groups` setting in
 the {es} realm, and then make use of it in a role mapping as per the example