Fix args to begin() in SX12xx settings examples

examples/SX126x/SX126x_Settings/SX126x_Settings.ino

@@ -74,7 +74,7 @@ void setup() {
   // sync word:                   0x34 (public network/LoRaWAN)
   // output power:                2 dBm
   // preamble length:             20 symbols
-  state = radio2.begin(915.0, 500.0, 6, 5, 0x34, 20);
+  state = radio2.begin(915.0, 500.0, 6, 5, 0x34, 2, 20);
   if (state == RADIOLIB_ERR_NONE) {
     Serial.println(F("success!"));
   } else {

examples/SX128x/SX128x_Settings/SX128x_Settings.ino

@@ -65,9 +65,10 @@ void setup() {
   // bandwidth:                   1625.0 kHz
   // spreading factor:            7
   // coding rate:                 5
+  // sync word:                   0x12 (private network)
   // output power:                2 dBm
   // preamble length:             20 symbols
-  state = radio2.begin(2450.0, 1625.0, 7, 5, 2, 20);
+  state = radio2.begin(2450.0, 1625.0, 7, 5, 0x12, 2, 20);
   if (state == RADIOLIB_ERR_NONE) {
     Serial.println(F("success!"));
   } else {