fixing uarl docs

docs/reference/bluetooth/uart-read.md

@@ -18,10 +18,9 @@ bluetooth.uartRead("");
 ### Example: Starting the Bluetooth UART service and then reading data received from another device which is terminated by ":" character and then displaying it
 
 ```blocks
-let uart_data: string = "";
+let uart_data = "";
 let connected = 0;
 basic.showString("UART");
-bluetooth.startUartService();
 bluetooth.onBluetoothConnected(() => {
     basic.showString("C");
     connected = 1;

docs/reference/bluetooth/uart-write.md

@@ -27,7 +27,6 @@ bluetooth.onBluetoothDisconnected(() => {
     basic.showString("D");
     connected = 0;
 });
-bluetooth.startUartService();
 input.onButtonPressed(Button.A, () => {
     if (connected == 1) {
         bluetooth.uartWrite("HELLO");