[IMP] upgrade: update and improve the upgrade processes and information

task ID: 2684744

closes odoo/documentation#1746

X-original-commit: 825e0ede21
Signed-off-by: Antoine Vandevenne (anv) <anv@odoo.com>

content/administration/maintain/online.rst

@@ -36,8 +36,8 @@ Upgrade
 =======
 
 If you are *not* on the latest **Online version**, you should receive an invitation to :doc:`upgrade
-<../upgrade/process>` your database. A **Rolling Release button** on your database's main screen
-proposes an upgrade to the latest version (e.g., 13.0 to 15.1).
+<../upgrade>` your database. A **Rolling Release button** on your database's main screen proposes an
+upgrade to the latest version (e.g., 13.0 to 15.1).
 
 .. important::
    - | **If your Odoo database's version is lower than the latest major release:**
@@ -53,7 +53,7 @@ proposes an upgrade to the latest version (e.g., 13.0 to 15.1).
    allows you to request a test upgrade of your database to check for any discrepancies.
 
 .. seealso::
-   - :doc:`../upgrade/process`
+   - :doc:`../upgrade`
    - :doc:`supported_versions`
 
 .. _online/duplicate:

content/administration/maintain/supported_versions.rst

@@ -11,8 +11,7 @@ Odoo provides support and bug fixing **for the 3 last major versions** of Odoo.
    Odoo releases intermediary versions called **Online versions** on the :doc:`Odoo Online <online>`
    hosting every two months. Odoo Online users can then benefit from the latest features of Odoo.
 
-   - Admins of Odoo Online databases are invited to :doc:`upgrade <../upgrade/process>` them
-     regularly.
+   - Admins of Odoo Online databases are invited to :doc:`upgrade <../upgrade>` them regularly.
    - Online versions are *not* released for Odoo.sh and On-Premise installations.
    - Online versions are listed below as *SaaS*.