Fixed be snn file identification and docs.

stdnum/be/ssn.py

@@ -1,7 +1,7 @@
-# coding=utf-8
-# insz.py - function for handling Belgian INSZ numbers
+# coding: utf-8
+# ssn.py - function for handling Belgian social security numbers
 #
-# Copyright (C) 2023 Jeff Horemans
+# Copyright (C) 2023-2024 Jeff Horemans
 #
 # This library is free software; you can redistribute it and/or
 # modify it under the terms of the GNU Lesser General Public
@@ -24,12 +24,11 @@
 number (Identificatienummer van de sociale zekerheid), NISS number (Numéro
 d'identification de la sécurité sociale) or ENSS number (Erkennungsnummer
 der sozialen Sicherheit), is the unique identification number of a person
-working or covered for social benefits in Belgium.
+working in or covered for social benefits in Belgium.
 
-Depending on a person's residency this number may be:
-
-* a Belgian National Number (Rijksregisternummer, Numéro National)
-* a Belgian BIS number
+For Belgian residents, the number is identical to their Belgian National
+Number (Rijksregisternummer, Numéro National).
+For non-residents, the number is identical to their Belgian BIS number.
 
 Both numbers consists of 11 digits and encode a person's date of birth and
 gender. It encodes the date of birth in the first 6 digits in the format