[FIX] Barcode: Retrieve EPCs sentence fix

closes #15760

X-original-commit: 2ff453e
Signed-off-by: Felicia Kuan (feku) <feku@odoo.com>
Signed-off-by: Erin Jerison (erjer) <erjer@odoo.com>

Author: erjer-odoo

content/applications/inventory_and_mrp/barcode/operations/retrieve_epcs.rst

@@ -40,7 +40,7 @@ Generating EPCs in Odoo
 =======================
 
 Generate EPCs for tracked products directly in Odoo. Products should be tracked by serial number,
-but this is not a requirement. A GTIN-14-compatible
+but this is not a requirement. A GTIN-14-compatible barcode must be set on the product.
 
 To retrieve the EPCs for a receipt of products: