Updating all pxt.microbit.org reference to makecode.microbit.org (#460)

docs/reference/bluetooth.md

@@ -37,7 +37,7 @@ bluetooth.onUartDataReceived(",", () => {})
 
 ```cards
 bluetooth.advertiseUid(42, 1, 7, true);
-bluetooth.advertiseUrl("https://pxt.microbit.org/", 7, true);
+bluetooth.advertiseUrl("https://makecode.microbit.org/", 7, true);
 bluetooth.stopAdvertising();
 ```
 

docs/reference/bluetooth/advertise-url.md

@@ -18,7 +18,7 @@ Read more at https://lancaster-university.github.io/microbit-docs/ble/eddystone/
 ## ~
 
 ```sig
-bluetooth.advertiseUrl("https://pxt.microbit.org/", 7, true);
+bluetooth.advertiseUrl("https://makecode.microbit.org/", 7, true);
 ```
 
 ### Parameters