Update doc

ChangeLog

@@ -160,6 +160,7 @@ NEW: #13739 #17390 Product API route added to get product stock and product with
 WARNING:
 
 Following changes may create regressions for some external modules, but were necessary to make Dolibarr better:
+* Module SimplePOS is deprecated. If you need a POS module, please use the module TakePOS.
 * The ICS value for direct debit or credit transfer is now store on each bank account instead of into the global setup.
 * API /setup/shipment_methods has been replaced with API /setup/shipping_methods
 * Field "total" renamed into to "total_ht" for table llx_facture, llx_facture_rec for better field name consistency