Improve Spring Session back-off documentation

Closes gh-23151

Author: wilkinsona

spring-boot-project/spring-boot-docs/src/main/asciidoc/spring-boot-features.adoc

@@ -5922,11 +5922,15 @@ When building a Servlet web application, the following stores can be auto-config
 * Hazelcast
 * MongoDB
 
+The Servlet auto-configuration replaces the need to use `@Enable*HttpSession`.
+
 When building a reactive web application, the following stores can be auto-configured:
 
 * Redis
 * MongoDB
 
+The reactive auto-configuration replaces the need to use `@Enable*WebSession`.
+
 If a single Spring Session module is present on the classpath, Spring Boot uses that store implementation automatically.
 If you have more than one implementation, you must choose the {spring-boot-autoconfigure-module-code}/session/StoreType.java[`StoreType`] that you wish to use to store the sessions.
 For instance, to use JDBC as the back-end store, you can configure your application as follows:
@@ -5949,6 +5953,10 @@ For instance, it is possible to customize the name of the table for the JDBC sto
 For setting the timeout of the session you can use the configprop:spring.session.timeout[] property.
 If that property is not set, the auto-configuration falls back to the value of configprop:server.servlet.session.timeout[].
 
+You can take control over Spring Session's configuration using `@Enable*HttpSession` (Servlet) or `@Enable@WebSession` (Reactive).
+This will cause the auto-configuratio to back off.
+Spring Session can then be configured using the annotation's attributes rather than the previously described configuration properties.
+
 
 
 [[boot-features-jmx]]