Polish Session Management Persistence Docs

Signed-off-by: Josh Cummings <3627351+jzheaux@users.noreply.github.com>
Signed-off-by: sankranti <sankranty@gmail.com>

Author: jzheaux

docs/modules/ROOT/pages/servlet/authentication/session-management.adoc

@@ -3,7 +3,9 @@
 
 Once you have got an application that is xref:servlet/authentication/index.adoc[authenticating requests], it is important to consider how that resulting authentication will be persisted and restored on future requests.
 
-Starting from Spring Security 6 security context is not persisted automatically by default, thus it is important to know what `requireExplicitSave` means in `HttpSecurity`.
+This is done automatically by default. If you have a custom filter or controller that is setting the security context, you will need to use a `SecurityContextRepository` to persist it across requests.
+
+If you are upgrading from an older version, you may be interested in the `requireExplicitSave` setting that preserves Spring Security 5's default, though note that this is primarily for migration purposes.
 
 If you like, <<how-it-works-requireexplicitsave,you can read more about what requireExplicitSave is doing>> or <<requireexplicitsave,why it's important>>. Otherwise, in most cases you are done with this section.