Fix Dutch language locale typo

Author: JTRNS

articles/applied-ai-services/form-recognizer/concept-invoice.md

@@ -172,7 +172,7 @@ See how data, including customer information, vendor details, and line items, is
 | • French (fr) | France (fr) |
 | • Italian (it) | Italy (it)|
 | • Portuguese (pt) | Portugal (pt), Brazil (br)|
-| • Dutch (de) | Netherlands (de)|
+| • Dutch (nl) | Netherlands (nl)|
 
 ## Field extraction