Update Namespaces_Prefixes.md

ontology/Namespaces_Prefixes.md

 ###  InterConnect ontologies
 @prefix ic-data: <http://ontology.tno.nl/interconnect/datapoint#> .
 
+@prefix ic-device: <http://ontology.tno.nl/interconnect/device#> .
+
 @prefix ic-fc: <http://ontology.tno.nl/interconnect/forecast#> .
 
+@prefix ic-flex: <http://ontology.tno.nl/interconnect/flexibility#> .
+
 @prefix ic-inc: <http://ontology.tno.nl/interconnect/incentivetable#> .
 
 @prefix ic-pwlm: <http://ontology.tno.nl/interconnect/powerlimit#> .
 
+@prefix ic-s2: <http://ontology.tno.nl/interconnect/s2#> .
+
 @prefix ic-tplg: <http://ontology.tno.nl/interconnect/topology#> .
 
 @prefix ic-uom: <http://ontology.tno.nl/interconnect/units#> .
 
 @prefix ic-user: <http://ontology.tno.nl/interconnect/user#> .
 
-
 ###  SAREF ontologies
 @prefix saref: <https://saref.etsi.org/core/> .