[ADD] PLM: engineering change order

closes odoo/documentation#6270

X-original-commit: fc9bbb7d22
Signed-off-by: Felicia Kuan (feku) <feku@odoo.com>
Co-authored-by: hojo-odoo <123424465+hojo-odoo@users.noreply.github.com>
Co-authored-by: Sho Ketchum <96748231+odoo-shke@users.noreply.github.com>
Co-authored-by: ksc-odoo <73958186+ksc-odoo@users.noreply.github.com>
Co-authored-by: Zachary Straub <zst@odoo.com>

content/applications/inventory_and_mrp/plm/manage_changes.rst

@@ -0,0 +1,9 @@
+=================
+Change management
+=================
+
+.. toctree::
+   :titlesonly:
+
+   manage_changes/eco_type
+   manage_changes/engineering_change_orders