Revamp OAuth 2.0 Client reactive documentation

Related gh-8174

Author: Steve Riesenberg

docs/modules/ROOT/nav.adoc

@@ -90,7 +90,7 @@
 *** xref:reactive/authorization/method.adoc[EnableReactiveMethodSecurity]
 ** xref:reactive/oauth2/index.adoc[OAuth2]
 *** xref:reactive/oauth2/login.adoc[OAuth 2.0 Login]
-*** xref:reactive/oauth2/access-token.adoc[OAuth2 Client]
+*** xref:reactive/oauth2/oauth2-client.adoc[OAuth2 Client]
 *** xref:reactive/oauth2/resource-server.adoc[OAuth 2.0 Resource Server]
 *** xref:reactive/registered-oauth2-authorized-client.adoc[@RegisteredOAuth2AuthorizedClient]
 ** xref:reactive/exploits/index.adoc[Protection Against Exploits]

docs/modules/ROOT/pages/reactive/oauth2/access-token.adoc

@@ -4,5 +4,5 @@
 Spring Security provides OAuth2 and WebFlux integration for reactive applications.
 
 * xref:reactive/oauth2/login.adoc[OAuth 2.0 Login] - Authenticating with OAuth 2.0
-* xref:reactive/oauth2/access-token.adoc[OAuth2 Client] - Making requests to an OAuth2 Resource Server as an OAuth2 Client
+* xref:reactive/oauth2/oauth2-client.adoc[OAuth2 Client] - Making requests to an OAuth2 Resource Server as an OAuth2 Client
 * xref:reactive/oauth2/resource-server.adoc[OAuth 2.0 Resource Server] - protecting a REST endpoint using OAuth 2.0