[REM] accounting: polish einvoicing page removal

closes #13766

Taskid: 4881134
Signed-off-by: Xavier Platteau (xpl) <[email protected]>

Author: chiaraprattico

content/applications/finance/accounting/customer_invoices/electronic_invoicing.rst

@@ -38,7 +38,6 @@ Odoo supports e-invoicing in many countries. Refer to the country's page for mor
 - :doc:`Netherlands <electronic_invoicing/netherlands>`
 - :doc:`Norway <electronic_invoicing/norway>`
 - :doc:`Peru <electronic_invoicing/peru>`
-- :doc:`Poland <electronic_invoicing/poland>`
 - :doc:`Romania <electronic_invoicing/romania>`
 - :doc:`Slovenia <electronic_invoicing/slovenia>`
 - :doc:`Spain <electronic_invoicing/spain>`