Copy edit NFCController.md

Change passive to active voice.

Author: Amanda Butler

docs/reference/api/connectivity/nfc/NFCController.md

@@ -1,6 +1,6 @@
 ## NFC controller
 
-Using an NFC controller with Mbed OS allows you to emulate NFC tags that can be read by a smartphone and generate NDEF messages on demand.
+Using an NFC controller with Mbed OS allows you to emulate NFC tags that a smartphone can read, as well as generate NDEF messages on demand.
 
 To use an NFC controller, you must initiate the instance with a driver instance, an event queue and a scratch buffer for NDEF messages.