minor symfony#17649 Sessions refactoring (fabpot)

This PR was squashed before being merged into the 5.4 branch.

Discussion
----------

Sessions refactoring

This is my modest attempt to merge everything related to the session into one document.
It's hard as much information was duplicated in several docs.
I hope you will like it.

Commits
-------

0c5fe69 Minor fixes after review
0055c99 Sessions refactoring

_build/redirection_map

@@ -248,7 +248,8 @@
 /cookbook/session/index /session
 /cookbook/session/limit_metadata_writes /reference/configuration/framework
 /session/limit_metadata_writes /reference/configuration/framework
-/cookbook/session/locale_sticky_session /session/locale_sticky_session
+/cookbook/session/locale_sticky_session /session#locale-sticky-session
+/cookbook/locale_sticky_session /session#locale-sticky-session
 /cookbook/session/php_bridge /session/php_bridge
 /cookbook/session/proxy_examples /session/proxy_examples
 /cookbook/session/sessions_directory /session/sessions_directory
@@ -477,8 +478,9 @@
 /components/translation/custom_message_formatter https://github.com/symfony/translation
 /components/notifier https://github.com/symfony/notifier
 /components/routing https://github.com/symfony/routing
-/doctrine/pdo_session_storage /session/database
-/doctrine/mongodb_session_storage /session/database
+/session/database /session#session-database
+/doctrine/pdo_session_storage /session#session-database-pdo
+/doctrine/mongodb_session_storage /session#session-database-mongodb
 /components/dotenv https://github.com/symfony/dotenv
 /components/mercure /mercure
 /components/polyfill_apcu https://github.com/symfony/polyfill-apcu

components/http_foundation.rst

@@ -752,7 +752,7 @@ the response content will look like this:
 Session
 -------
 
-The session information is in its own document: :doc:`/components/http_foundation/sessions`.
+The session information is in its own document: :doc:`/session`.
 
 Safe Content Preference
 -----------------------
@@ -829,10 +829,9 @@ Learn More
     :maxdepth: 1
     :glob:
 
-    /components/http_foundation/*
     /controller
     /controller/*
-    /session/*
+    /session
     /http_cache/*
 
 .. _nginx: https://www.nginx.com/resources/wiki/start/topics/examples/xsendfile/