Update quality-on-demand.yaml

MNO replaced with network operator

code/API_definitions/quality-on-demand.yaml

@@ -681,7 +681,7 @@ components:
         * `phoneNumber`
         * `networkAccessIdentifier`
 
-        NOTE1: the MNO might support only a subset of these options. The API invoker can provide multiple identifiers to be compatible across different MNOs. In this case the identifiers MUST belong to the same device
+        NOTE1: the network operator might support only a subset of these options. The API invoker can provide multiple identifiers to be compatible across different network operators. In this case the identifiers MUST belong to the same device
         NOTE2: for the Commonalities release v0.4, we are enforcing that the networkAccessIdentifier is only part of the schema for future-proofing, and CAMARA does not currently allow its use. After the CAMARA meta-release work is concluded and the relevant issues are resolved, its use will need to be explicitly documented in the guidelines.
       type: object
       properties: