Add Core Model / Components in ref doc

Closes gh-671

Author: jgrandja

docs/src/docs/asciidoc/configuration-model.adoc

@@ -3,19 +3,22 @@
 :toc: left
 :toclevels: 1
 
-This page is under construction.
-
 [[oauth2-authorization-server-configurer]]
-== `OAuth2AuthorizationServerConfigurer`
+== OAuth2AuthorizationServerConfigurer
 
 This section is under construction.
 
 [[oauth2-authorization-server-configuration]]
-== `OAuth2AuthorizationServerConfiguration`
+== OAuth2AuthorizationServerConfiguration
 
 This section is under construction.
 
 [[provider-settings]]
-== `ProviderSettings` / `ProviderContext`
+== ProviderSettings
+
+This section is under construction.
+
+[[provider-context]]
+== ProviderContext
 
 This section is under construction.