docs: Add 1.2.0 upgrade guide for Product Module (#4981)

* docs: Add 1.2.0 upgrade guide for Product Module

* Update docs/content/upgrade-guides/modules/product/1-2-0.md

Co-authored-by: Shahed Nasser <shahednasser@gmail.com>

* Update docs/content/upgrade-guides/modules/product/1-2-0.md

Co-authored-by: Shahed Nasser <shahednasser@gmail.com>

* Address pr comments

* address pr comments

* fix lint issue

---------

Co-authored-by: Shahed Nasser <shahednasser@gmail.com>

www/docs/sidebars.js

@@ -1866,6 +1866,20 @@ module.exports = {
         },
       ],
     },
+    {
+      type: "category",
+      label: "Modules",
+      collapsible: false,
+      customProps: {
+        sidebar_is_group_headline: true,
+      },
+      items: [
+        {
+          type: "autogenerated",
+          dirName: "upgrade-guides/modules",
+        },
+      ],
+    },
     {
       type: "category",
       label: "Plugins",