Slightly reword comment

src/cbor/streaming.c

@@ -597,7 +597,8 @@ struct cbor_decoder_result cbor_stream_decode(
     case 0xFF:
       /* Break */
       callbacks->indef_break(context);
-      // Never happens, the case is exhaustive; make compiler happy
+      // Never happens, the switch statement is exhaustive on the 1B range; make
+      // compiler happy
     default:
       return result;
   }